cdsl-cad/backend/engine/cdsl_engine/runtime.py

"""Session-based CDSL execution with atomic executor registry.

The runtime was split into focused modules (behavior-preserving move):

- ``runtime_base``: shared error types and the ``ExtentVector`` value.
- ``session``: ``ExecutionSession`` and the ``GeometryAdapter`` protocol.
- ``extents``: end-condition planning.
- ``pattern_transform``: translate/mirror/rotate parameter algebra for replay.

This module keeps the executor registry, the per-atomic executors, and the
``analyze_cdsl`` / ``rebuild_cdsl`` entry points.  The moved names are
re-exported so every historical ``cdsl_engine.runtime`` import keeps working.
"""

from __future__ import annotations

from copy import deepcopy
import math
from pathlib import Path
from typing import Any, Callable, Protocol

from .build123d_adapter import Build123dGeometryAdapter  # noqa: F401  (historical re-export)
from .capabilities import CapabilityAnalyzer, pattern_transform_blocker, sketch_ids_required_by_contract
from .extents import (
    _extent_reference,
    _extent_vectors,
    _extent_vectors_from_normal,
    _normal_from_sketch,
    _side_extent_vectors,
    _targeted_extent_vector,
)
from .pattern_transform import (
    _box_circular_is_exact,
    _coordinate_axis_direction,
    _mirrored_node,
    _mirrored_sketch,
    _normal_is_coordinate_axis,
    _owner_plane_frame,
    _pattern_operation_node,
    _reflect_point,
    _rotated_node,
    _rotated_point,
    _rotated_sketch,
    _rotated_vector,
    _transformed_loft_profiles,
    _translated_node,
    _translated_sketch,
)
from .runtime_base import ExtentVector, FeatureExecutionError, RuntimeExecutionError
from .session import ExecutionSession, GeometryAdapter
from .sketch_solver import CORE_SHAPE_GENERATORS, resolve_required_sketches
from .specs import (
    AxisSpec, BendSpec, GearSpec, HoleSpec, PlaneSpec, RackSpec, ThreadSpec, Vector3,
    pattern_instance_member_id, transform_copy_member_id,
    vector_add, vector_cross, vector_dot, vector_scale, vector_subtract, vector_unit,
)
from .topology import (
    CapabilityResult, FeaturePlanNode, FeatureResult, RuntimeDiagnostic,
    SelectorResolution, TopologyDelta, TopologyDeltaRelation, TopologyRecord, TopologyRegistry,
)


ALL_ATOMIC_IDS = frozenset({
    "extrude_add_blind", "extrude_add_blind_with_hole", "extrude_add_two_sided", "extrude_cut_blind", "extrude_cut_two_sided", "extrude_surface",
    "extrude_cut_through", "extrude_from_face", "loft_add", "loft_add_with_cap_face", "sweep_add",
    "revolve_add", "revolve_cut", "revolve_surface", "hole_blind", "hole_countersink",
    "hole_counterbore", "sphere_add", "box_add", "cylinder_add",
    "reference_plane", "reference_axis",
    "hole_wizard", "fillet", "chamfer", "shell", "pattern_linear", "pattern_mirror",
    "pattern_circular", "boolean_bodies", "transform_bodies", "delete_bodies",
    "thread_add", "thread_cut",
    "bend_add",
    "gear_add", "rack_add",
})


class AtomicExecutor(Protocol):
    atomic_id: str

    def preflight(self, node: FeaturePlanNode, session: "ExecutionSession") -> CapabilityResult: ...
    def execute(self, node: FeaturePlanNode, session: "ExecutionSession") -> FeatureResult: ...


def _revolve_axis(node: FeaturePlanNode, session: ExecutionSession) -> AxisSpec:
    raw_axis = node.params.get("axis") or {}
    if raw_axis.get("origin_mm") is not None and raw_axis.get("direction") is not None:
        return AxisSpec.from_mapping(raw_axis)
    selector = raw_axis.get("selector") if isinstance(raw_axis, dict) else None
    if not isinstance(selector, dict):
        selector = next((item for item in node.selectors if item.get("kind") == "axis"), None)
    if not isinstance(selector, dict):
        raise FeatureExecutionError(
            "missing_revolve_axis",
            "Revolve requires an explicit axis or an owner-qualified reference-axis selector",
        )
    resolution = session.resolve(selector)
    if resolution.status != "resolved" or resolution.record is None:
        raise ValueError(resolution.diagnostic.message if resolution.diagnostic else "revolve axis was not resolved")
    if not isinstance(resolution.record.value, AxisSpec):
        raise FeatureExecutionError(
            "unsupported_revolve_axis", "The resolved context is not an axis", actual_kind=resolution.record.kind,
        )
    return resolution.record.value


def _validate_revolve_axis_in_sketch_plane(axis: AxisSpec, sketch: dict[str, Any]) -> None:
    """Defend direct CDSL execution from an out-of-plane revolve axis."""
    plane = PlaneSpec.from_mapping(sketch.get("workplane") or {})
    direction_normal_dot = abs(vector_dot(axis.direction, plane.normal))
    if direction_normal_dot > 1e-7:
        raise ValueError(
            "REVOLVE_AXIS_NOT_IN_SKETCH_PLANE: params.axis.direction must be parallel to "
            f"sketch.workplane; abs(dot(axis_direction, plane_normal))={direction_normal_dot:.3g}"
        )
    origin_plane_offset = abs(vector_dot(vector_subtract(axis.origin_mm, plane.origin_mm), plane.normal))
    if origin_plane_offset > 1e-6:
        raise ValueError(
            "REVOLVE_AXIS_NOT_IN_SKETCH_PLANE: params.axis.origin_mm must lie in "
            f"sketch.workplane; plane_offset_mm={origin_plane_offset:.3g}"
        )


def _cut_explicit_body_members(session: ExecutionSession, tool: Any) -> dict[str, Any]:
    """Apply a cut to each independently owned body without erasing ownership.

    A CADFS NEW body stays independently addressable even when a later REMOVE
    feature affects several active bodies.  Cutting the aggregate first loses
    that identity, so this path uses the equivalent per-member set difference
    and drops only members that the tool removes completely.
    """
    members: dict[str, Any] = {}
    for feature_id, body in session.body_members.items():
        result = session.adapter.cut(body, tool)
        if abs(float(result.volume)) > 1e-12:
            members[feature_id] = result
    return members


def _extruded_tool(
    node: FeaturePlanNode,
    faces: list[Any],
    profile_normal: Vector3,
    session: ExecutionSession,
) -> tuple[Any, TopologyDelta | None]:
    """Build one extrude tool, retaining caps only from one exact builder result."""
    extents = _extent_vectors_from_normal(node, faces, profile_normal, session)
    draft = node.params.get("draft")
    taper_deg = 0.0
    if isinstance(draft, dict):
        taper_deg = float(draft["angle_deg"])
        if not bool(draft["pull_direction"]):
            taper_deg = -taper_deg
    topology_delta: TopologyDelta | None = None
    solids: list[Any] = []
    for face in faces:
        for extent in extents:
            if draft is not None:
                if len(faces) == 1 and len(extents) == 1:
                    solid, topology_delta = session.adapter.extrude_taper_with_topology_delta(
                        face, extent.vector, taper_deg,
                    )
                    solids.append(solid)
                else:
                    solids.append(session.adapter.extrude_taper(face, extent.vector, taper_deg))
            elif extent.trim_to is None and len(faces) == 1 and len(extents) == 1:
                solid, topology_delta = session.adapter.extrude_with_topology_delta(face, extent.vector)
                solids.append(solid)
            elif extent.trim_to is None:
                solids.append(session.adapter.extrude(face, extent.vector))
            else:
                solids.append(session.adapter.extrude_trimmed(face, extent.trim_to, extent.vector))
    tool = None
    for solid in solids:
        tool = session.adapter.fuse(tool, solid)
    if tool is None:
        raise ValueError("extrude produced no solid")
    return tool, topology_delta


def _apply_primary_tool(
    node: FeaturePlanNode,
    session: ExecutionSession,
    tool: Any,
    *,
    cutting: bool,
    topology_delta: TopologyDelta | None = None,
) -> FeatureResult:
    """Apply a profile-derived tool while preserving only final-snapshot topology evidence."""
    if cutting:
        if session.body is None:
            raise ValueError("cut feature has no body")
        members = _cut_explicit_body_members(session, tool)
        if not members:
            session.clear_body()
            return session.result(node)
        body = session.adapter.cut(session.body, tool)
        topology_delta = None
    elif node.params.get("result_mode") == "new_body":
        body = session.adapter.combine(session.body, tool)
        members = {**session.body_members, node.feature_id: tool}
    else:
        body = session.adapter.fuse(session.body, tool)
        members = {node.feature_id: body}
        # A fuse rebuilds subshape identity. Builder evidence belongs only to
        # an unchanged standalone/new-body prism snapshot.
        if session.body is not None:
            topology_delta = None
    session.register_body(
        node.feature_id, body, replay_node=node, body_members=members, topology_delta=topology_delta,
    )
    return session.result(node)


def _shape_from_primary(node: FeaturePlanNode, session: ExecutionSession, *, sketch: dict[str, Any] | None = None) -> FeatureResult:
    # 主形状特征（拉伸 / 旋转）的统一入口：由草图生成实体并与当前主体做布尔合并或切除。
    
    # 1. 取草图：优先使用外部传入的 sketch_override（阵列/镜像等重放场景），
    #    否则按 sketch_id 从会话草图表中取原始草图。
    selected_sketch = sketch or session.sketches.get(str(node.sketch_id))
    if selected_sketch is None:
        raise ValueError("primary feature has no resolved sketch")
    # 2. 从草图解析闭合轮廓区域（faces），没有闭合区域就无法生成实体。
    faces = session.adapter.faces_for_sketch(selected_sketch)
    if not faces:
        raise ValueError("sketch does not create a closed profile region")
    if node.atomic_id == "extrude_add_blind_with_hole":
        resolved = [session.resolve(selector) for selector in node.selectors]
        failed = next((item for item in resolved if item.status != "resolved"), None)
        if failed or len(resolved) != 1 or resolved[0].record is None or resolved[0].record.kind != "face":
            raise ValueError(failed.diagnostic.message if failed and failed.diagnostic else "profile hole selector is unresolved")
        if len(faces) != 1:
            raise ValueError("profile hole extrusion requires exactly one outer sketch region")
        faces = [session.adapter.face_with_holes(faces[0], [resolved[0].record.value])]
    topology_delta: TopologyDelta | None = None
    # 3. 按特征类型生成子实体：
    if node.atomic_id.startswith("extrude_"):
        #   拉伸：先按终止条件（盲孔/贯穿/至面/双侧等）求出位移向量，
        #   再对每个面沿每个向量做拉伸，得到实体列表。up_to_surface 在
        #   profile 与目标面非均匀相交时（extent.trim_to 非空）改用裁剪
        #   拉伸：穿透后与目标面求交，只保留可达部分（issue #5）。
        tool, topology_delta = _extruded_tool(
            node, faces, _normal_from_sketch(selected_sketch), session,
        )
    else:
        #   旋转：解析旋转轴并校验旋转角，然后绕轴旋转每个面得到实体列表。
        axis = _revolve_axis(node, session)
        _validate_revolve_axis_in_sketch_plane(axis, selected_sketch)
        angle = float(node.params.get("angle_deg") or 0.0)
        if angle <= 0:
            raise ValueError("revolve requires angle_deg > 0")
        #   reverse=true 表示绕轴反向扫掠（SolidWorks 旋转方向反转）：取负
        #   旋转角，与 extrude 的 reverse（_extent_vectors 反转拉伸方向）同一
        #   语义。profile_schema.json 已声明 revolve.* optional_params 含
        #   reverse，cdsl_schema.json revolveParams 也已允许，这里补齐 runtime
        #   侧实现，使三方合同一致。
        if bool(node.params.get("reverse")):
            angle = -angle
        tool = None
        for solid in (session.adapter.revolve(face, angle, axis) for face in faces):
            tool = session.adapter.fuse(tool, solid)
        if tool is None:
            raise ValueError("revolve produced no solid")
    return _apply_primary_tool(
        node, session, tool, cutting="cut" in node.atomic_id, topology_delta=topology_delta,
    )


def _execute_extrude_from_face(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    resolved = [session.resolve(selector) for selector in node.selectors]
    failed = next((item for item in resolved if item.status != "resolved"), None)
    if failed or len(resolved) != 1 or resolved[0].record is None or resolved[0].record.kind != "face":
        raise ValueError(failed.diagnostic.message if failed and failed.diagnostic else "derived profile face is unresolved")
    face = resolved[0].record.value
    tool, topology_delta = _extruded_tool(node, [face], session.adapter.face_normal(face), session)
    return _apply_primary_tool(
        node, session, tool, cutting=node.params.get("operation") == "cut", topology_delta=topology_delta,
    )


def _execute_revolve_surface(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # Surface revolve 的 profile 是单一闭合 wire。它只生成独立 shell，不能参与
    # 当前实体 body 的 fuse/cut，也不能把其结果误报为新的实体 body。
    sketch = session.sketches.get(str(node.sketch_id))
    if sketch is None:
        raise ValueError("surface revolve has no resolved sketch")
    faces = session.adapter.faces_for_sketch(sketch)
    if len(faces) != 1 or faces[0].inner_wires():
        raise ValueError("surface revolve requires exactly one closed profile without holes")
    axis = _revolve_axis(node, session)
    _validate_revolve_axis_in_sketch_plane(axis, sketch)
    angle = float(node.params.get("angle_deg") or 0.0)
    if angle <= 0:
        raise ValueError("surface revolve requires angle_deg > 0")
    if bool(node.params.get("reverse")):
        angle = -angle
    surface_id = session.register_surface(
        node.feature_id,
        session.adapter.revolve_surface(faces[0].outer_wire(), angle, axis),
    )
    return session.result(node, include_body=False, surface_id=surface_id)


def _execute_extrude_surface(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # surfaceEntities 的曲面拉伸沿用实体特征已 lower 的距离，但始终独立登记为
    # shell。它既不改变 active solid，也不以曲面参与实体 fuse/cut。
    sketch = session.sketches.get(str(node.sketch_id))
    if sketch is None:
        raise ValueError("surface extrude has no resolved sketch")
    direction = vector_unit(_normal_from_sketch(sketch), field_name="sketch normal")
    if bool(node.params.get("reverse")):
        direction = vector_scale(direction, -1)
    distance = float(node.params.get("distance_mm") or 0.0)
    if distance <= 0:
        raise ValueError("surface extrude requires distance_mm > 0")
    wires = session.adapter.surface_wires_for_sketch(sketch)
    surface = session.adapter.extrude_surface(wires, vector_scale(direction, distance))
    reverse_distance = float(node.params.get("reverse_distance_mm") or 0.0)
    if reverse_distance > 0:
        opposite = session.adapter.extrude_surface(wires, vector_scale(direction, -reverse_distance))
        surface = session.adapter.combine_surfaces(surface, opposite)
    surface_id = session.register_surface(node.feature_id, surface)
    return session.result(node, include_body=False, surface_id=surface_id)


def _combine_members(session: ExecutionSession, members: dict[str, Any]) -> Any:
    body = None
    for member in members.values():
        body = session.adapter.combine(body, member)
    if body is None:
        raise ValueError("booleanBodies produced no result bodies")
    return body


def _execute_boolean_bodies(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # booleanBodies 总是作用于 source feature 的明确 body 输出，不能回退为
    # 当前聚合 body。这样相邻独立实体不会意外成为工具或目标。
    params = node.params
    target_ids = _member_sources(
        node, session, "target_feature_ids", pattern_instance_parameter="target_pattern_instance_refs",
    )
    tool_ids = _member_sources(
        node, session, "tool_feature_ids", pattern_instance_parameter="tool_pattern_instance_refs",
    )
    targets = {feature_id: session.body_members[feature_id] for feature_id in target_ids}
    tools = {feature_id: session.body_members[feature_id] for feature_id in tool_ids}
    target = _combine_members(session, targets)
    tool = _combine_members(session, tools)
    operation = str(params.get("operation") or "")
    topology_delta: TopologyDelta | None = None
    if operation == "union":
        result, topology_delta = session.adapter.fuse_with_topology_delta(target, tool)
    elif operation == "subtract":
        result, topology_delta = session.adapter.cut_with_topology_delta(target, tool)
    elif operation == "intersect":
        result, topology_delta = session.adapter.intersect_with_topology_delta(target, tool)
    else:
        raise ValueError(f"unsupported booleanBodies operation {operation!r}")
    members = {
        feature_id: body
        for feature_id, body in session.body_members.items()
        if feature_id not in set(target_ids + tool_ids)
    }
    members[node.feature_id] = result
    if bool(params.get("keep_tools")):
        members.update(tools)
    session.register_body(
        node.feature_id, _combine_members(session, members), body_members=members, topology_delta=topology_delta,
    )
    return session.result(node)


def _pattern_instance_sources(
    node: FeaturePlanNode,
    session: ExecutionSession,
    parameter: str = "pattern_instance_refs",
) -> list[str]:
    """Resolve CDSL pattern-instance refs to their internal body-member keys."""
    resolved: list[str] = []
    for reference in node.params.get(parameter) or ():
        if not isinstance(reference, dict):
            raise ValueError("pattern instance reference must be an object")
        pattern_id = str(reference.get("pattern_feature_id") or "")
        source_id = str(reference.get("source_feature_id") or "")
        instance = reference.get("instance_index")
        if not pattern_id or not source_id or not isinstance(instance, int):
            raise ValueError("pattern instance reference is incomplete")
        pattern = session.nodes.get(pattern_id)
        if pattern is None or pattern.atomic_id not in {"pattern_circular", "pattern_mirror"}:
            raise ValueError(f"pattern instance owner is unavailable: {pattern_id}")
        params = pattern.params
        if source_id not in {str(value) for value in params.get("source_feature_ids") or ()}:
            raise ValueError("pattern instance source is not selected by its pattern")
        count = int(params.get("pattern_count") or 0)
        excluded = {int(value) for value in params.get("excluded_instance_indices") or ()}
        if (
            pattern.atomic_id == "pattern_mirror" and instance != 1
        ) or (
            pattern.atomic_id == "pattern_circular" and (instance < 1 or instance >= count or instance in excluded)
        ):
            raise ValueError("pattern instance is outside the pattern's surviving instances")
        member_id = pattern_instance_member_id(pattern_id, source_id, instance)
        if member_id not in session.body_members:
            raise ValueError(f"pattern instance body is unavailable: {pattern_id}/{source_id}/{instance}")
        if member_id not in resolved:
            resolved.append(member_id)
    return resolved


def _transform_copy_sources(node: FeaturePlanNode, session: ExecutionSession) -> list[str]:
    """Resolve source-qualified outputs of preceding multi-body COPY transforms."""
    resolved: list[str] = []
    for reference in node.params.get("transform_copy_refs") or ():
        if not isinstance(reference, dict):
            raise ValueError("transform COPY reference must be an object")
        transform_id = str(reference.get("transform_feature_id") or "")
        source_id = str(reference.get("source_feature_id") or "")
        if not transform_id or not source_id:
            raise ValueError("transform COPY reference is incomplete")
        transform = session.nodes.get(transform_id)
        params = transform.params if transform is not None else {}
        sources = params.get("source_feature_ids") or []
        if (
            transform is None
            or transform.atomic_id != "transform_bodies"
            or not bool(params.get("make_copy"))
            or not isinstance(sources, list)
            or len(sources) < 2
            or source_id not in {str(value) for value in sources}
        ):
            raise ValueError(f"transform COPY owner/source is unavailable: {transform_id}/{source_id}")
        member_id = transform_copy_member_id(transform_id, source_id)
        if member_id not in session.body_members:
            raise ValueError(f"transform COPY body is unavailable: {transform_id}/{source_id}")
        if member_id not in resolved:
            resolved.append(member_id)
    return resolved


def _member_sources(
    node: FeaturePlanNode,
    session: ExecutionSession,
    parameter: str,
    *,
    pattern_instance_parameter: str | None = None,
    allow_transform_copies: bool = False,
) -> list[str]:
    source_ids = [str(value) for value in node.params.get(parameter) or []]
    if pattern_instance_parameter is not None:
        source_ids.extend(_pattern_instance_sources(node, session, pattern_instance_parameter))
    if allow_transform_copies:
        source_ids.extend(_transform_copy_sources(node, session))
    if not source_ids:
        raise ValueError(f"{node.atomic_id} requires explicit {parameter}")
    missing = [feature_id for feature_id in source_ids if feature_id not in session.body_members]
    if missing:
        raise ValueError(f"{node.atomic_id} source bodies are unavailable: " + ", ".join(missing))
    return source_ids


def _execute_transform_bodies(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # FeatureScript transform targets explicit bodies.  Do not move the
    # aggregate session body, because it may include unrelated members.
    source_ids = _member_sources(
        node, session, "source_feature_ids", pattern_instance_parameter="pattern_instance_refs", allow_transform_copies=True,
    )
    make_copy = bool(node.params.get("make_copy"))
    direct_sources = node.params.get("source_feature_ids") or []
    if make_copy and isinstance(direct_sources, list) and len(direct_sources) > 1:
        # The aggregate is only an export compound. Each source transform has
        # its own B-rep builder and is the only output a later COPY query may
        # select. Do not attach an aggregate topology delta to source members.
        members = dict(session.body_members)
        members.update({
            transform_copy_member_id(node.feature_id, source_id): session.adapter.transform(
                session.body_members[source_id], dict(node.params.get("transform") or {}),
            )
            for source_id in source_ids
        })
        session.register_body(
            node.feature_id, _combine_members(session, members), body_members=members,
        )
        return session.result(node)
    source = _combine_members(session, {feature_id: session.body_members[feature_id] for feature_id in source_ids})
    transformed, topology_delta = session.adapter.transform_with_topology_delta(
        source, dict(node.params.get("transform") or {}),
    )
    members = dict(session.body_members)
    if not make_copy:
        for feature_id in source_ids:
            members.pop(feature_id)
    members[node.feature_id] = transformed
    session.register_body(
        node.feature_id, _combine_members(session, members), body_members=members, topology_delta=topology_delta,
    )
    return session.result(node)


def _execute_delete_bodies(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # Deletion is a body-graph operation, never a Boolean subtraction.  A
    # selected member can be disjoint or overlap another independent body.
    source_ids = _member_sources(node, session, "target_feature_ids")
    members = {feature_id: body for feature_id, body in session.body_members.items() if feature_id not in set(source_ids)}
    if members:
        session.register_body(node.feature_id, _combine_members(session, members), body_members=members)
    else:
        session.clear_body()
    return session.result(node)


def _execute_loft_add(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 放样截面不占用 feature.sketch_id；按有序 profile_sketch_ids 取已解析
    # 草图，并由 adapter 统一校验单闭环、无内环等内核输入约束。
    profile_ids = node.params.get("profile_sketch_ids") or []
    profiles: list[dict[str, Any]] = []
    for sketch_id in profile_ids:
        sketch = session.sketches.get(str(sketch_id))
        if sketch is None:
            raise ValueError(f"loft profile sketch {sketch_id!r} is not resolved")
        profiles.append(sketch)
    solid, topology_delta = session.adapter.loft_with_topology_delta(profiles)
    body = session.adapter.fuse(session.body, solid)
    # Fusing a loft into an existing body replaces its subshapes through a
    # different builder. Only an initial direct loft can expose this builder's
    # cap evidence for the final B-rep snapshot.
    if session.body is not None:
        topology_delta = None
    session.register_body(node.feature_id, body, replay_node=node, topology_delta=topology_delta)
    return session.result(node)


def _execute_loft_add_with_cap_face(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    resolved = [session.resolve(selector) for selector in node.selectors]
    failed = next((item for item in resolved if item.status != "resolved"), None)
    if failed or len(resolved) != 1 or resolved[0].record is None or resolved[0].record.kind != "face":
        raise ValueError(failed.diagnostic.message if failed and failed.diagnostic else "cap-face loft selector is unresolved")
    profile_ids = node.params.get("profile_sketch_ids") or []
    profiles: list[dict[str, Any]] = []
    for sketch_id in profile_ids:
        sketch = session.sketches.get(str(sketch_id))
        if sketch is None:
            raise ValueError(f"loft profile sketch {sketch_id!r} is not resolved")
        profiles.append(sketch)
    solid = session.adapter.loft_with_cap_face(resolved[0].record.value, profiles)
    session.register_body(node.feature_id, session.adapter.fuse(session.body, solid), replay_node=node)
    return session.result(node)


def _sweep_path(node: FeaturePlanNode, session: ExecutionSession) -> Any:
    # 路径是 self-contained CDSL 数据，避免重放时依赖临时草图或 source id。
    path = node.params.get("path") or {}
    if not isinstance(path, dict):
        raise ValueError("sweep path must be an object")
    plane = PlaneSpec.from_mapping(path.get("workplane") or {})
    segment = path.get("segment") or {}
    if not isinstance(segment, dict):
        raise ValueError("sweep path segment must be an object")
    kind = str(segment.get("type") or "")
    if kind == "line":
        local_points = [segment.get("start"), segment.get("end")]
    elif kind == "bspline":
        local_points = segment.get("points") or []
    else:
        raise ValueError(f"unsupported sweep path segment {kind!r}")
    if len(local_points) < 2 or any(not isinstance(point, list) or len(point) != 2 for point in local_points):
        raise ValueError("sweep path requires two-dimensional points")

    def point(value: list[float]) -> Vector3:
        return vector_add(
            plane.origin_mm,
            vector_add(vector_scale(plane.x_dir, float(value[0])), vector_scale(plane.y_dir, float(value[1]))),
        )

    def tangent(value: Any) -> Vector3 | None:
        if value is None:
            return None
        if not isinstance(value, list) or len(value) != 2:
            raise ValueError("sweep path tangent must contain two coordinates")
        return vector_add(vector_scale(plane.x_dir, float(value[0])), vector_scale(plane.y_dir, float(value[1])))

    return session.adapter.sweep_path(
        [point(value) for value in local_points],
        start_tangent=tangent(segment.get("start_tangent")),
        end_tangent=tangent(segment.get("end_tangent")),
        parameters=[float(value) for value in segment.get("parameters") or []] or None,
    )


def _execute_sweep_add(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None = None) -> FeatureResult:
    profile = sketch or session.sketches.get(str(node.sketch_id))
    if profile is None:
        raise ValueError("sweep has no resolved profile sketch")
    faces = session.adapter.faces_for_sketch(profile)
    if len(faces) != 1:
        raise ValueError("sweep requires exactly one closed profile region")
    solid, topology_delta = session.adapter.sweep_with_topology_delta(
        faces[0], _sweep_path(node, session),
        is_frenet=bool(node.params.get("is_frenet", False)),
    )
    is_new_body = node.params.get("result_mode") == "new_body"
    body = session.adapter.combine(session.body, solid) if is_new_body else session.adapter.fuse(session.body, solid)
    # A union rebuilds topology, so the pipe-shell builder cannot prove the
    # final aggregate's relations. The independent-body path retains its exact
    # subshape identity and may expose evidence for the new member.
    if session.body is not None and not is_new_body:
        topology_delta = None
    session.register_body(node.feature_id, body, replay_node=node, topology_delta=topology_delta)
    return session.result(node)


def _execute_reference_plane(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 基准面特征（reference_plane）执行入口：从参数解析平面并登记为拓扑上下文。
    
    # 1. 从特征参数 plane 中解析出平面定义 PlaneSpec（原点到法向）。
    plane = PlaneSpec.from_mapping(node.params.get("plane") or {})
    # 2. 将该平面注册到拓扑上下文，供后续特征（如草图基准、参考轴）引用。
    session.topology.register_context(node.feature_id, plane)
    # 3. 返回结果对象，并将该平面作为上下文一并携带。
    return session.result(node, context=plane)


def _execute_reference_axis(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 基准轴特征（reference_axis）执行入口：由参数直接定义轴，或由两个基准平面求交线得到轴。
    
    # 1. 尝试直接取参数：若同时给出原点 origin_mm 与方向 direction，则直接构造轴。
    params = node.params.get("axis") or {}
    if params.get("origin_mm") and params.get("direction"):
        axis = AxisSpec.from_mapping(params)
    else:
        # 2. 否则从特征选择器中筛选出已解析的基准平面。
        planes = [session.resolve(selector) for selector in node.selectors if selector.get("kind") == "plane"]
        resolved = [item.record.value for item in planes if item.status == "resolved" and isinstance(item.record.value, PlaneSpec)]
        # 3. 校验：轴需要两个非平行的平面，不足两个则报错。
        if len(resolved) < 2:
            raise ValueError("reference axis requires two uniquely resolved planes")
        # 4. 用两平面法线叉积求交线方向；若方向长度接近 0 说明两平面平行，无法成轴。
        first, second = resolved[0], resolved[1]
        n1, n2 = first.normal, second.normal
        direction = vector_cross(n1, n2)
        squared_length = vector_dot(direction, direction)
        if squared_length <= 1e-18:
            raise ValueError("reference planes are parallel and cannot define an axis")
        # 5. 求交线上的一点：两平面到各自原点的垂距参与线性组合，得到交线上的最近点。
        d1 = vector_dot(n1, first.origin_mm)
        d2 = vector_dot(n2, second.origin_mm)
        point = vector_scale(vector_add(vector_scale(vector_cross(n2, direction), d1), vector_scale(vector_cross(direction, n1), d2)), 1 / squared_length)
        # 6. 由该点与归一化的交线方向组合成基准轴 AxisSpec。
        axis = AxisSpec(origin_mm=point, direction=vector_unit(direction, field_name="reference axis"))
    # 7. 注册为拓扑上下文，并返回结果对象（携带该轴）。
    session.topology.register_context(node.feature_id, axis)
    return session.result(node, context=axis)


def _register_added_solid(
    session: ExecutionSession,
    node: FeaturePlanNode,
    solid: Any,
) -> None:
    """Register an additive primitive solid (box/cyl/sphere/thread/gear/rack/bend).

    When ``node.params['result_mode'] == "new_body"`` the primitive is kept as
    an independent body member so that downstream ``boolean_bodies`` can
    reference it without pulling in the accumulated fuse history. The current
    body is replaced by a Compound that preserves both, matching the
    ``extrude_add_blind`` ``new_body`` semantics. Any other value (including
    missing) falls back to the legacy fuse-into-body behavior.
    """
    if node.params.get("result_mode") == "new_body":
        combined = session.adapter.combine(session.body, solid)
        members = {**session.body_members, node.feature_id: solid}
        session.register_body(node.feature_id, combined, replay_node=node, body_members=members)
        return
    fused = session.adapter.fuse(session.body, solid)
    session.register_body(node.feature_id, fused, replay_node=node)


def _execute_sphere(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 球体特征（sphere_add）执行入口：按球心与半径生成球体并并入当前主体。

    # 1. 解析参数：半径 radius_mm 与球心 center_mm。
    radius = float(node.params.get("radius_mm") or 0.0)
    center = node.params.get("center_mm") or []
    # 2. 校验：半径必须大于 0，球心必须是三维坐标。
    if radius <= 0 or len(center) != 3:
        raise ValueError("sphere_add requires radius_mm and a three-dimensional center_mm")
    # 3. 由适配器创建球体实体。
    solid = session.adapter.sphere(radius, (float(center[0]), float(center[1]), float(center[2])))
    # 4. 球体与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    return session.result(node)


def _execute_box(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 长方体特征（box_add）执行入口：以几何中心 center_mm 与三向尺寸生成原生长方体。
    # 1. 解析并校验尺寸与中心，非法输入抛出带具体原因的 ValueError。
    try:
        length = float(node.params.get("length_mm") or 0.0)
        width = float(node.params.get("width_mm") or 0.0)
        height = float(node.params.get("height_mm") or 0.0)
        center = node.params.get("center_mm") or []
    except (TypeError, ValueError) as error:
        raise ValueError("box dimensions must be numeric") from error
    if length <= 0 or width <= 0 or height <= 0 or len(center) != 3:
        raise ValueError("box_add requires positive length_mm/width_mm/height_mm and a three-dimensional center_mm")
    # 2. 生成世界轴对齐的 plane frame：plane 原点是长方体的最小角点（中心减去半
    #    尺寸），长/宽/高分别沿世界 x/y/z 生长（build123d Solid.make_box 语义）。
    corner = (
        float(center[0]) - length / 2,
        float(center[1]) - width / 2,
        float(center[2]) - height / 2,
    )
    plane = PlaneSpec.from_mapping({"origin_mm": corner, "x_dir": [1, 0, 0], "normal": [0, 0, 1]})
    solid = session.adapter.box(length, width, height, plane)
    # 3. 与当前主体做布尔并后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    return session.result(node)


def _execute_cylinder(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 圆柱特征（cylinder_add）执行入口：axis 的原点是底面圆心、方向为轴向；
    # axis 缺省为世界 +Z 过原点（底面圆心落在 (0,0,0)）。
    # 1. 解析并校验半径与高度，非法输入抛出带具体原因的 ValueError。
    try:
        radius = float(node.params.get("radius_mm") or 0.0)
        height = float(node.params.get("height_mm") or 0.0)
    except (TypeError, ValueError) as error:
        raise ValueError("cylinder dimensions must be numeric") from error
    if radius <= 0 or height <= 0:
        raise ValueError("cylinder_add requires positive radius_mm and height_mm")
    raw_axis = node.params.get("axis")
    if raw_axis is not None and not (
        isinstance(raw_axis, dict) and raw_axis.get("origin_mm") is not None and raw_axis.get("direction") is not None
    ):
        raise ValueError("cylinder_add axis must define origin_mm and direction")
    axis = AxisSpec.from_mapping(raw_axis) if isinstance(raw_axis, dict) else None
    # 2. 由适配器创建原生圆柱（axis=None 即世界 +Z 过原点）。
    solid = session.adapter.cylinder(radius, height, axis)
    # 3. 与当前主体做布尔并后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    return session.result(node)


def _execute_thread(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 螺纹特征（thread_add）执行入口：按规格生成参数化螺纹段并并入当前主体。
    # 1. 解析并校验尺寸/牙距/轴，非法输入抛出带具体原因的 ValueError。
    spec = ThreadSpec.from_feature(node.atomic_id, node.params)
    # 2. 由适配器门面生成沿 spec.axis 放置的外螺纹实心段。
    solid = session.adapter.thread_solid(spec)
    # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    return session.result(node)


def _thread_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    # 螺纹特征（thread_add/thread_cut）不需要草图平面，丢弃该参数后执行。
    # thread_cut 走布尔差分支：从已有主体切出内螺纹槽，而非并入外螺纹段。
    del sketch
    if node.atomic_id == "thread_cut":
        return _execute_thread_cut(node, session)
    return _execute_thread(node, session)


def _execute_thread_cut(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 内螺纹（thread_cut）执行入口：ThreadSpec.from_feature 对 thread_cut 恒置
    # internal=True，生成牙顶外放 INTERNAL_CUT_OVERLAP_MM 的切削刀具，沿
    # spec.axis 放置后从当前主体布尔差出全深螺旋牙槽（宿主通常已预打光孔，
    # 刀具 core 落在孔腔中，仅外放的牙槽层切入孔壁）。
    # 1. 解析并校验尺寸/牙距/轴，非法输入抛出带具体原因的 ValueError。
    spec = ThreadSpec.from_feature(node.atomic_id, node.params)
    # 2. 由适配器门面生成沿 spec.axis 放置的内螺纹切削刀具实心段。
    tool = session.adapter.thread_solid(spec)
    # 3. 从当前主体布尔差（cut）后登记为新主体，并返回该特征的结果对象。
    session.register_body(node.feature_id, session.adapter.cut(session.body, tool), replay_node=node)
    return session.result(node)


def _execute_bend(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 折弯特征（bend_add）执行入口：按规格生成等厚折弯板并并入当前主体。
    # 1. 解析并校验板厚/宽度/折痕链与放置平面，非法输入抛出带具体原因的 ValueError。
    spec = BendSpec.from_feature(node.params)
    # 2. 由适配器门面生成沿 spec.frame 放置的折弯实心段。
    solid = session.adapter.bend_solid(spec)
    # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    return session.result(node)


def _bend_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    # 折弯特征（bend_add）不需要草图平面，丢弃该参数后执行。
    del sketch
    return _execute_bend(node, session)


def _execute_gear(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 齿轮特征（gear_add）执行入口：按规格生成渐开线齿轮并入当前主体。
    # 1. 解析并校验模数/齿数/齿宽/螺旋角与放置轴，非法输入抛出带具体原因的 ValueError。
    spec = GearSpec.from_feature(node.params)
    # 2. 由适配器门面生成沿 spec.axis 放置的齿轮实体（直齿/斜齿/人字齿）。
    solid = session.adapter.gear_solid(spec)
    # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    # 4. 小齿数根切风险：不阻断执行，附加 info 级诊断供完成报告如实披露。
    diagnostics: list[RuntimeDiagnostic] = []
    if spec.teeth_count < 17:
        diagnostics.append(RuntimeDiagnostic(
            code="undercut_risk",
            message=(
                f"Gear with {spec.teeth_count} teeth and a 20 degree pressure angle is undercut-prone; "
                "standard involute geometry is generated without profile shift"
            ),
            feature_id=node.feature_id,
        ))
    return session.result(node, diagnostics=diagnostics)


def _gear_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    # 齿轮特征（gear_add）不需要草图平面，丢弃该参数后执行。
    del sketch
    return _execute_gear(node, session)


def _execute_rack(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 齿条特征（rack_add）执行入口：按规格生成直线齿条并入当前主体。
    # 1. 解析并校验模数/齿数/厚度/压力角与放置轴，非法输入抛出带具体原因的 ValueError。
    spec = RackSpec.from_feature(node.params)
    # 2. 由适配器门面生成沿 spec.axis 放置的齿条实体（齿沿轴方向伸出）。
    solid = session.adapter.rack_solid(spec)
    # 3. 与当前主体做布尔并（fuse）后登记为新主体，并返回该特征的结果对象。
    _register_added_solid(session, node, solid)
    return session.result(node)


def _rack_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    # 齿条特征（rack_add）不需要草图平面，丢弃该参数后执行。
    del sketch
    return _execute_rack(node, session)


def _host_plane(resolution: SelectorResolution) -> PlaneSpec:
    if resolution.record is None:
        raise ValueError(resolution.diagnostic.message if resolution.diagnostic else "host face was not resolved")
    geometry = resolution.record.geometry
    return PlaneSpec.from_mapping({
        "origin_mm": geometry["center_mm"],
        "x_dir": [1, 0, 0] if abs(float(geometry["normal"][0])) < 0.9 else [0, 1, 0],
        "normal": geometry["normal"],
    })


def _hole_starts(
    spec: HoleSpec,
    *,
    host_plane: PlaneSpec,
    positions_are_local: bool,
) -> list[Vector3]:
    starts: list[Vector3] = []
    for point in spec.positions_mm:
        if positions_are_local:
            start = vector_add(
                vector_add(
                    vector_add(host_plane.origin_mm, vector_scale(host_plane.x_dir, point[0])),
                    vector_scale(host_plane.y_dir, point[1]),
                ),
                vector_scale(host_plane.normal, point[2]),
            )
        else:
            start = point
        starts.append(start)
    return starts


def _execute_hole(node: FeaturePlanNode, session: ExecutionSession, *, wizard: bool = False) -> FeatureResult:
    # 孔特征（hole）执行入口：在指定宿主面上按孔规格生成切除工具，并从主体上减去。
    
    # 1. 校验：孔是切除操作，必须先有主体。
    if session.body is None:
        raise ValueError("hole feature has no body")
    # 2. 确定宿主面 host_face：
    host_selector = node.params.get("host_face")
    if isinstance(host_selector, dict) and isinstance(host_selector.get("frame"), dict):
        #   若直接带 frame（平面定义），则以该平面为宿主，孔位按局部坐标解释。
        host = PlaneSpec.from_mapping(host_selector["frame"])
        positions_are_local = True
    else:
        #   否则从特征选择器中取 face，解析出宿主平面，孔位按世界坐标解释。
        selectors = list(node.selectors)
        if isinstance(host_selector, dict):
            selectors.append(host_selector)
        selector = next((item for item in selectors if item.get("kind") == "face"), None)
        if selector is None:
            raise ValueError("hole requires host_face selector or frame")
        host = _host_plane(session.resolve(selector))
        positions_are_local = False
    # 3. 解析孔规格 HoleSpec（直径、深度、类型等，wizard 模式提供额外默认值）。
    spec = HoleSpec.from_feature(node.atomic_id, node.params, wizard=wizard)
    # 4. A host-face normal is an outward B-rep orientation, so its inverse
    # always enters the material.  Inferring direction from the global body
    # centre fails for concave or multi-leg parts: for example, the top face
    # of an L bracket can sit below the whole body's centre and the old rule
    # drilled outward, producing a no-op feature reported as successful.
    # The selected topology face is the local, authoritative orientation.
    inward = vector_scale(host.normal, -1)
    # 5. 生成孔切除工具：按孔规格、起始位置、内方向及“贯穿到主体底面”的深度构造工具实体。
    tool = session.adapter.hole_tool(
        spec,
        _hole_starts(spec, host_plane=host, positions_are_local=positions_are_local),
        inward,
        session.adapter.body_span(session.body, inward) + 2.0,
    )
    # 6. 从主体上减去工具实体，登记新主体并返回结果。
    #    thread 是装饰螺纹（无螺距、不进实体几何，SolidWorks/STEP 的螺纹孔
    #    即光滑孔）：孔按光滑圆柱孔执行，同时记录 info 级诊断便于批量报告
    #    追溯降级数量（issue #9，capabilities 已不再拒绝 thread）。
    diagnostics: list[RuntimeDiagnostic] = []
    if wizard and node.params.get("thread"):
        diagnostics.append(RuntimeDiagnostic(
            code="thread_decoration_ignored",
            message="Thread decoration is not modeled; the hole falls back to a plain cylindrical bore",
            feature_id=node.feature_id,
        ))
    session.register_body(node.feature_id, session.adapter.cut(session.body, tool), replay_node=node)
    return session.result(node, diagnostics=diagnostics)


def _selector_edges(node: FeaturePlanNode, session: ExecutionSession, *, tangent_propagation: bool = False) -> list[Any]:
    resolved: list[SelectorResolution] = [session.resolve(selector) for selector in node.selectors]
    failed = next((item for item in resolved if item.status != "resolved"), None)
    if failed:
        raise ValueError(failed.diagnostic.message if failed.diagnostic else "selector resolution failed")

    def is_body_boundary(edge: Any) -> bool:
        # 圆柱、圆锥等周期面会带一条仅属于自身的参数 seam。该线不是实体
        # 边界；FeatureScript 以 FACE 选择倒角时不应将其当作额外的待倒角边，
        # 否则连续的锥面会被错误切成两段。显式 EDGE selector 仍可表达真正的
        # 单边选择，所以这里只约束由 FACE 展开的候选边。
        face_count = sum(
            1
            for face in session.body.faces()
            if any(candidate.is_same(edge) for candidate in face.edges())
        )
        return face_count >= 2

    edges: list[Any] = []
    for item in resolved:
        if item.record.kind == "edge":
            edges.append(item.record.value)
        elif item.record.kind == "face":
            edges.extend(edge for edge in item.record.value.edges() if is_body_boundary(edge))
    if not edges:
        raise ValueError("selectors did not resolve any edges")
    return session.adapter.tangent_edges(session.body, edges) if tangent_propagation else edges


def _shell_target(node: FeaturePlanNode, session: ExecutionSession) -> tuple[Any, list[Any]]:
    # shell 的 remove-face selector 必须全部属于同一实体。CADFS 允许一个
    # Compound 中保留多个独立 body，不能将整组 body 交给 OCC 后由内核猜测
    # 应抽壳的成员。
    resolved = [session.resolve(selector) for selector in node.selectors]
    failed = next((item for item in resolved if item.status != "resolved"), None)
    if failed:
        raise ValueError(failed.diagnostic.message if failed.diagnostic else "selector resolution failed")
    records = [item.record for item in resolved if item.record is not None]
    if not records or any(record.kind != "face" for record in records):
        raise ValueError("shell selectors must resolve to faces")
    target_ids = {record.body_id for record in records}
    if len(target_ids) != 1:
        raise ValueError("shell faces must belong to one target body")
    target_id = next(iter(target_ids))
    members = session.adapter.body_solids(session.body)
    if len(members) == 1:
        target = members[0]
    else:
        if target_id is None or session.body_id is None:
            raise ValueError("shell target body is unresolved")
        prefix = f"{session.body_id}:"
        if not target_id.startswith(prefix):
            raise ValueError("shell target body is outside the active body set")
        try:
            member_index = int(target_id[len(prefix):])
        except ValueError as error:
            raise ValueError("shell target body has an invalid member id") from error
        if member_index < 0 or member_index >= len(members):
            raise ValueError("shell target body member is unavailable")
        target = members[member_index]
    target_feature_id = node.params.get("target_feature_id")
    if target_feature_id is not None:
        if not isinstance(target_feature_id, str) or not target_feature_id:
            raise ValueError("shell target_feature_id is invalid")
        declared = session.body_members.get(target_feature_id)
        if declared is None:
            raise ValueError("shell target body is no longer an independently selectable member")
        declared_solids = session.adapter.body_solids(declared)
        if len(declared_solids) != 1:
            raise ValueError("shell target body must resolve to exactly one active solid")
        if not declared_solids[0].is_same(target):
            raise ValueError("shell target body does not match the resolved face member")
    return target, [record.value for record in records]


def _replace_shell_target(session: ExecutionSession, target: Any, replacement: Any) -> Any:
    # 仅替换抽壳目标实体；其他独立实体保持原样和原有相对顺序。
    members = session.adapter.body_solids(session.body)
    if len(members) == 1:
        return replacement
    replaced = False
    result = None
    for member in members:
        if member.is_same(target):
            result = session.adapter.combine(result, replacement)
            replaced = True
        else:
            result = session.adapter.combine(result, member)
    if not replaced or result is None:
        raise ValueError("shell target solid is no longer part of the active body")
    return result


def _execute_shell(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 抽壳特征：移除 selector 所指面，并按 CADFS thickness 向实体内部偏置。
    if session.body is None:
        raise ValueError("shell has no body")
    thickness = float(node.params.get("thickness_mm") or 0)
    if thickness <= 0:
        raise ValueError("shell thickness_mm must be > 0")
    target, faces = _shell_target(node, session)
    result, topology_delta = session.adapter.shell_with_topology_delta(
        target, faces, thickness, inward=bool(node.params.get("inward", True)),
    )
    session.register_body(
        node.feature_id, _replace_shell_target(session, target, result), replay_node=node,
        topology_delta=topology_delta,
    )
    return session.result(node)


def _execute_fillet(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 圆角特征（fillet）执行入口：对选中边按半径做圆角，平滑尖角与棱边。

    # 1. 校验：圆角作用于已有主体，必须先有主体。
    if session.body is None:
        raise ValueError("fillet has no body")
    # 2. 解析圆角半径并校验必须大于 0。
    radius = float(node.params.get("radius_mm") or 0)
    if radius <= 0:
        raise ValueError("fillet radius_mm must be > 0")
    # 3. 解析目标边（支持 tangent_propagation 相切传播），并执行圆角。
    body, topology_delta = session.adapter.fillet_with_topology_delta(
        session.body, radius, _selector_edges(node, session, tangent_propagation=bool(node.params.get("tangent_propagation"))),
    )
    # 4. 登记新主体并返回结果。
    session.register_body(node.feature_id, body, replay_node=node, topology_delta=topology_delta)
    return session.result(node)


def _execute_chamfer(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    # 倒角特征（chamfer）执行入口：对选中边按距离做倒角（可带第二距离形成不对称倒角）。

    # 1. 校验：倒角作用于已有主体，必须先有主体。
    if session.body is None:
        raise ValueError("chamfer has no body")
    # 2. 解析主距离并校验必须大于 0。
    distance = float(node.params.get("distance_mm") or 0)
    if distance <= 0:
        raise ValueError("chamfer distance_mm must be > 0")
    # 3. 解析第二距离与角度（importer 对 SolidWorks Distance-Angle 倒角产出
    #    angle_rad，单位为弧度）。第二距离 = 主距离 * tan(angle)；angle=45° 时
    #    tan=1，退化为等距倒角（与历史行为一致，零回归）。
    #    注意：build123d 的 length/length2 侧向分配依赖面的枚举顺序，对非 45°
    #    倒角仅保证量级正确，距离所在侧可能反转。
    distance_2 = node.params.get("distance_2_mm")
    angle_rad = node.params.get("angle_rad")
    if distance_2 is None and angle_rad is not None:
        distance_2 = distance * math.tan(float(angle_rad))
    # 4. 解析目标边（支持相切传播），执行倒角。
    edges = _selector_edges(node, session, tangent_propagation=bool(node.params.get("tangent_propagation")))
    diagnostics: list[RuntimeDiagnostic] = []
    topology_delta: TopologyDelta | None = None
    try:
        body, topology_delta = session.adapter.chamfer_with_topology_delta(session.body, distance, distance_2, edges)
    except ValueError as error:
        # 显式 surfaceEntities 可以在后续实体上留下曲面分区边界。若标准
        # OCC 倒角因环域宽度不足而拒绝，只允许在该 shell 给出同轴边界证据
        # 时按原始距离构造受限倒角；没有证明时仍保留原始内核失败。
        if distance_2 is not None or not session.surface_members:
            raise
        try:
            body = session.adapter.surface_limited_chamfer(
                session.body, distance, edges, list(session.surface_members.values()),
            )
        except ValueError:
            raise error
        diagnostics.append(RuntimeDiagnostic(
            "chamfer_surface_limited",
            "Chamfer was limited by an explicit coaxial surface boundary",
            feature_id=node.feature_id,
            detail={"distance_mm": distance, "surface_count": len(session.surface_members)},
        ))
    # 5. 登记新主体并返回结果。
    session.register_body(node.feature_id, body, replay_node=node, topology_delta=topology_delta)
    return session.result(node, diagnostics=diagnostics)


def _execute_linear_pattern(node: FeaturePlanNode, session: ExecutionSession, execute: Callable[[FeaturePlanNode, ExecutionSession, dict[str, Any] | None], FeatureResult]) -> FeatureResult:
    # 线性阵列特征（pattern）执行入口：沿两个方向按数量与间距重放源特征形成阵列。
    
    # 1. 取源特征的 replay 定义（源特征按 feature_id 在会话中登记，供本阵列重放）。
    params = node.params
    sources = session.replay_sources(params.get("source_feature_ids") or [])
    if not sources:
        raise ValueError("pattern source features have no replay definitions")
    # 2. 解析两个方向的实例数量。
    count_1 = int(params.get("pattern_count_1") or 1)
    count_2 = int(params.get("pattern_count_2") or 1)
    # 3. 解析两个方向的步长向量（方向单位向量 × 间距），作为阵列位移基准。
    direction_1 = vector_scale(vector_unit(tuple(float(value) for value in (params.get("direction_1") or [1, 0, 0])), field_name="pattern direction_1"), float(params.get("spacing_1_mm") or 0))
    direction_2 = vector_scale(vector_unit(tuple(float(value) for value in (params.get("direction_2") or [0, 1, 0])), field_name="pattern direction_2"), float(params.get("spacing_2_mm") or 0))
    # 4. 双重循环生成每个阵列实例（跳过原点 0,0 处，那里是源特征本身）。
    for first in range(count_1):
        for second in range(count_2):
            if first == 0 and second == 0:
                continue
            #   计算当前实例相对源特征的偏移向量。
            offset = vector_add(vector_scale(direction_1, first), vector_scale(direction_2, second))
            for source in sources:
                #   逐个源特征克隆并按偏移平移后重放执行（草图也同步平移）。
                dependency = pattern_transform_blocker(source)
                if dependency:
                    raise ValueError(f"pattern source uses an unsupported {dependency}")
                cloned = _translated_node(source, f"{node.feature_id}.p{first}_{second}.{source.feature_id}", offset, session)
                sketch = session.sketches.get(str(source.sketch_id))
                execute(cloned, session, _translated_sketch(sketch, offset) if sketch else None)
    # 5. 记录本阵列的 replay 定义：后续阵列若选中本阵列，按定义递归重放，
    #    而非复制当前主体做近似。
    # A later pattern may select this pattern feature.  The definition is
    # replayed recursively, never approximated by copying the current body.
    session.replay_definitions[node.feature_id] = node
    return session.result(node)


def _execute_mirror_pattern(node: FeaturePlanNode, session: ExecutionSession) -> FeatureResult:
    mirror = node.params.get("mirror_plane") or {}
    resolution = session.resolve(mirror)
    if resolution.status != "resolved" or not isinstance(resolution.record.value, PlaneSpec):
        raise ValueError(resolution.diagnostic.message if resolution.diagnostic else "mirror plane was not resolved")
    source_ids = [str(value) for value in node.params.get("source_feature_ids") or ()]
    if (
        source_ids
        and all(source_id in session.body_members for source_id in source_ids)
        and all(
            (source := session.nodes.get(source_id)) is not None
            and source.params.get("result_mode") == "new_body"
            for source_id in source_ids
        )
    ):
        # Only a direct NEW body has a standalone source identity after a
        # mirror. A hole, dress-up, or ordinary additive source is merely an
        # aggregate successor and must use the feature-replay path below.
        # Keeping this condition identical to capability preflight prevents a
        # downstream COPY body query from selecting an arbitrary aggregate.
        members = dict(session.body_members)
        body = session.body
        for source_id in source_ids:
            mirrored = session.adapter.mirror(session.body_members[source_id], resolution.record.value)
            members[pattern_instance_member_id(node.feature_id, source_id, 1)] = mirrored
            body = session.adapter.fuse(body, mirrored)
        if body is None:
            raise ValueError("mirror pattern produced no body")
        session.register_body(node.feature_id, body, replay_node=node, body_members=members)
        return session.result(node)
    if node.params.get("mirror_current_body"):
        # CADFS SWEPT_BODY 表示被后续 feature 持续修改的同一实体。这里复制
        # 当前 B-rep 再镜像并合并，不能重放其初始 additive feature，否则会
        # 丢失后续 cut/fillet 并生成独立错误实体。
        if session.body is None:
            raise ValueError("mirror current body has no active body")
        mirrored = session.adapter.mirror(session.body, resolution.record.value)
        session.register_body(node.feature_id, session.adapter.fuse(session.body, mirrored), replay_node=node)
        return session.result(node)
    sources = session.replay_sources(node.params.get("source_feature_ids") or [])
    if not sources:
        raise ValueError("mirror pattern source features have no replay definitions")
    for source in sources:
        dependency = pattern_transform_blocker(source)
        if dependency:
            raise ValueError(f"mirror pattern source uses an unsupported {dependency}")
        if source.atomic_id == "box_add" and not _normal_is_coordinate_axis(resolution.record.value.normal):
            # box_add 是固定世界轴对齐的原生图元：跨非坐标平面镜像会产生倾斜朝向，
            # 当前参数语义无法表达，静默重放会得到错误几何 → 明确拒绝。跨坐标平面
            # （法向平行于任一坐标轴）的镜像仍然精确。
            raise ValueError("box_add mirror is exact only across coordinate-aligned mirror planes")
        cloned = _mirrored_node(source, f"{node.feature_id}.m.{source.feature_id}", resolution.record.value, session)
        sketch = session.sketches.get(str(source.sketch_id))
        _execute_node(cloned, session, _mirrored_sketch(sketch, resolution.record.value) if sketch else None)
    session.replay_definitions[node.feature_id] = node
    return session.result(node)


def _circular_source_is_axisymmetric(node: FeaturePlanNode, session: ExecutionSession, axis: AxisSpec) -> bool:
    """Whether rotating a direct circular extrusion creates no new geometry."""
    if node.atomic_id not in {"extrude_add_blind", "extrude_add_two_sided"}:
        return False
    sketch = session.sketches.get(str(node.sketch_id))
    if sketch is None:
        return False
    profile = sketch.get("profile") or {}
    circle = profile if profile.get("type") == "circle" else None
    if circle is None:
        contours = profile.get("contours") or []
        segments = (contours[0] or {}).get("segments") if len(contours) == 1 else []
        circle = segments[0] if isinstance(segments, list) and len(segments) == 1 and segments[0].get("type") == "circle" else None
    center = (circle or {}).get("center")
    if not isinstance(center, list) or len(center) != 2:
        return False
    try:
        plane = PlaneSpec.from_mapping(sketch.get("workplane") or {})
    except (TypeError, ValueError):
        return False
    if abs(vector_dot(plane.normal, axis.direction)) < 1 - 1e-7:
        return False
    world_center = vector_add(
        plane.origin_mm,
        vector_add(vector_scale(plane.x_dir, float(center[0])), vector_scale(plane.y_dir, float(center[1]))),
    )
    offset = vector_subtract(world_center, axis.origin_mm)
    radial = vector_subtract(offset, vector_scale(axis.direction, vector_dot(offset, axis.direction)))
    return math.sqrt(vector_dot(radial, radial)) <= 1e-6


def _advance_copy_topology_records(
    records: list[TopologyRecord], topology_delta: TopologyDelta | None,
) -> list[TopologyRecord]:
    """Carry COPY provenance through one exact adapter-history operation.

    Pattern copies are separate CDSL results even when their solids fuse into
    a single final body.  The temporary records here are never selector
    candidates themselves.  They only retain instance ownership while opaque
    OCC history proves a unique subshape continuation to the final snapshot.
    """
    if topology_delta is None:
        return []
    advanced: list[TopologyRecord] = []
    for record in records:
        values: list[Any] = []
        for relation in topology_delta.relations:
            if (
                relation.kind != record.kind
                or relation.event not in {"preserved", "modified"}
                or not TopologyRegistry._same_topology_value(record.value, relation.source_value)
            ):
                continue
            for value in relation.result_values:
                if not any(TopologyRegistry._same_topology_value(value, known) for known in values):
                    values.append(value)
        # A split/merge has no unique COPY owner in the present selector
        # contract. Keep the executable model, but do not make a claim that a
        # later COPY selector can bind one arbitrary descendant.
        if len(values) != 1:
            continue
        advanced.append(TopologyRecord(
            record_id=record.record_id,
            kind=record.kind,
            feature_id=record.feature_id,
            body_id=record.body_id,
            geometry=dict(record.geometry),
            value=values[0],
            owner_feature_ids=record.owners,
            output_roles=record.output_roles,
            output_role_sources=record.output_role_sources,
        ))
    return advanced


def _copy_snapshot_topology_delta(records: list[TopologyRecord]) -> TopologyDelta | None:
    """Bridge traced final COPY handles into the one registered body snapshot."""
    if not records:
        return None
    return TopologyDelta(
        operation="pattern_circular_copy_snapshot",
        relations=tuple(
            # ``record.value`` has already passed through every transform/fuse
            # builder in this pattern and is an actual final-B-rep handle. The
            # identity relation merely connects that evidence to the fresh
            # adapter snapshot; it is not a geometric rebinding shortcut.
            TopologyDeltaRelation("preserved", record.kind, record.value, (record.value,))
            for record in records
        ),
    )


def _has_usable_pattern_body(session: ExecutionSession, body: Any | None) -> bool:
    """Reject a formally valid but empty OCC boolean result before publishing it."""
    if body is None or not session.adapter.body_solids(body):
        return False
    try:
        return abs(float(body.volume)) > 1e-12
    except (AttributeError, TypeError, ValueError):
        return False


def _execute_circular_pattern(node: FeaturePlanNode, session: ExecutionSession, execute: Callable[[FeaturePlanNode, ExecutionSession, dict[str, Any] | None], FeatureResult]) -> FeatureResult:
    # 环形阵列特征（pattern_circular）执行入口：绕显式轴按数量与包角重放源特征
    # 形成环形阵列。源特征整体绕轴旋转（绝对坐标变换），非复制当前主体的近似。
    params = node.params
    raw_axis = params.get("axis")
    if not (isinstance(raw_axis, dict) and raw_axis.get("origin_mm") is not None and raw_axis.get("direction") is not None):
        raise ValueError("circular pattern requires an explicit axis with origin_mm and direction")
    axis = AxisSpec.from_mapping(raw_axis)
    count = int(params.get("pattern_count") or 1)
    if count < 1:
        raise ValueError("circular pattern pattern_count must be >= 1")
    sweep_angle_deg = float(params.get("sweep_angle_deg") or 360.0)
    operation_mode = str(params.get("operation_mode") or "add")
    if operation_mode not in {"add", "remove"}:
        raise ValueError("circular pattern operation_mode must be add or remove")
    excluded = {int(value) for value in params.get("excluded_instance_indices") or []}
    if any(instance < 1 or instance >= count for instance in excluded):
        raise ValueError("circular pattern excluded instance is outside the generated range")
    sources = session.replay_sources(params.get("source_feature_ids") or [])
    if not sources:
        raise ValueError("circular pattern source features have no replay definitions")
    source_ids = [source.feature_id for source in sources]
    pre_pattern_members = dict(session.body_members)
    if operation_mode == "add" and all(source_id in session.body_members for source_id in source_ids):
        # A pattern over explicit NEW/kept body members has a stronger contract
        # than replay: each copy is an independently addressable rigid image of
        # the named source member.  Keep the instance keys in the body graph so
        # a later CADFS COPY(BODY) transform/delete can name exactly one copy.
        members = dict(session.body_members)
        body = session.body
        traced_copy_records: list[TopologyRecord] = []
        for instance in range(1, count):
            if instance in excluded:
                continue
            angle_deg = sweep_angle_deg * instance / count
            transform = {
                "type": "rotation",
                "axis": {"origin_mm": list(axis.origin_mm), "direction": list(axis.direction)},
                "angle_deg": angle_deg,
            }
            for source_id in source_ids:
                member_id = pattern_instance_member_id(node.feature_id, source_id, instance)
                owner_id = f"{node.feature_id}.c{instance}.{source_id}"
                source_body = session.body_members[source_id]
                copy, transform_delta = session.adapter.transform_with_topology_delta(source_body, transform)
                source_records = session.adapter.topology_records(
                    source_body, owner_id, f"body:{node.feature_id}:copy:{instance}:{source_id}:source",
                )
                copy_records = _advance_copy_topology_records(source_records, transform_delta)
                members[member_id] = copy
                body, fuse_delta = session.adapter.fuse_with_topology_delta(body, copy)
                traced_copy_records = _advance_copy_topology_records(
                    [*traced_copy_records, *copy_records], fuse_delta,
                )
        if _has_usable_pattern_body(session, body):
            session.register_body(
                node.feature_id, body, replay_node=node, body_members=members,
                topology_delta=_copy_snapshot_topology_delta(traced_copy_records),
                topology_predecessors=traced_copy_records,
            )
            return session.result(node)
        # An OCC boolean may report IsDone/valid for an empty result when a
        # copied fused body contains coincident internal topology. The normal
        # pattern contract can replay the source feature contribution instead;
        # it is the only sound fallback because it keeps source operation,
        # sketch frame, and body lifecycle semantics intact.
    for instance in range(1, count):
        if instance in excluded:
            continue
        # 实例 i 位于包角 sweep_angle_deg 的 i/count 处（i=0 即源特征本身）。
        angle_deg = sweep_angle_deg * instance / count
        angle_rad = math.radians(angle_deg)
        for source in sources:
            # 与阵列轴同心、法向平行的圆形实体拉伸在任意环形实例中均与
            # 原实体完全重合。重复执行它会把同一 B-rep 再次交给 OCC fuse，
            # 后续非轴对称 source 可能因此丢失已生成的实体分支。
            if _circular_source_is_axisymmetric(source, session, axis):
                continue
            dependency = pattern_transform_blocker(source)
            if dependency:
                raise ValueError(f"circular pattern source uses an unsupported {dependency}")
            if source.atomic_id == "box_add" and not _box_circular_is_exact(axis, angle_rad):
                raise ValueError(
                    "box_add circular pattern is exact only for coordinate-axis rotation "
                    "by multiples of 180 degrees"
                )
            cloned = _rotated_node(source, f"{node.feature_id}.c{instance}.{source.feature_id}", axis, angle_rad, session)
            cloned = _pattern_operation_node(cloned, operation_mode)
            # CADFS pattern instances are copies of the source result, not
            # independent `NEW` operations.  Replay them through normal add
            # semantics: intersecting or face-sharing instances fuse, while
            # spatially separate copies remain separate solids in the result.
            if cloned.params.get("result_mode") == "new_body":
                cloned = FeaturePlanNode(
                    cloned.feature_id, cloned.atomic_id, cloned.name, cloned.depends_on,
                    {key: value for key, value in cloned.params.items() if key != "result_mode"},
                    cloned.selectors, cloned.sketch_id, cloned.declared_status, cloned.source_feature,
                )
            sketch = session.sketches.get(str(source.sketch_id))
            execute(cloned, session, _rotated_sketch(sketch, axis, angle_rad) if sketch else None)
    # 环形阵列本身是完整 B-rep 结果的 producer。每个 replay 子特征都会更新
    # active body；循环结束后必须用 pattern feature 重新登记最终快照，否则后续
    # selector binding 会只保留最后一个实例的 body id，漏掉其它 COPY 实例。
    if session.body is None:
        raise ValueError("circular pattern produced no body")
    # Replaying a fused sole-body source may be more robust than copying its
    # full aggregate B-rep (for example, when a rotationally invariant base
    # would otherwise be unioned with itself). If that replay still has one
    # physical body, the direct source remains a proven alias of the current
    # member. Preserve it for a following parts-scoped operation such as
    # shell; do not extend this alias across multi-body patterns or multiple
    # source members.
    members = {node.feature_id: session.body}
    if (
        len(source_ids) == 1
        and len(pre_pattern_members) == 1
        and source_ids[0] in pre_pattern_members
        and _has_usable_pattern_body(session, session.body)
        and len(session.adapter.body_solids(session.body)) == 1
    ):
        members[source_ids[0]] = session.body
    session.register_body(node.feature_id, session.body, replay_node=node, body_members=members)
    return session.result(node)


def _circular_pattern_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_circular_pattern(node, session, _execute_node)


def _execute_node(node: FeaturePlanNode, session: ExecutionSession, sketch_override: dict[str, Any] | None = None) -> FeatureResult:
    executor = EXECUTORS.get(node.atomic_id)
    if executor is None:
        raise ValueError(f"No executor registered for {node.atomic_id!r}")
    previous_feature_id = session.active_feature_id
    session.active_feature_id = node.feature_id
    try:
        return executor(node, session, sketch_override)
    finally:
        session.active_feature_id = previous_feature_id


ExecutorFunction = Callable[[FeaturePlanNode, ExecutionSession, dict[str, Any] | None], FeatureResult]


def _primary_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    return _shape_from_primary(node, session, sketch=sketch)


def _revolve_surface_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_revolve_surface(node, session)


def _extrude_surface_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_extrude_surface(node, session)


def _loft_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_loft_add(node, session)


def _loft_cap_face_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_loft_add_with_cap_face(node, session)


def _sweep_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    return _execute_sweep_add(node, session, sketch)


def _reference_plane_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_reference_plane(node, session)


def _reference_axis_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_reference_axis(node, session)


def _sphere_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_sphere(node, session)


def _box_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_box(node, session)


def _cylinder_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_cylinder(node, session)


def _hole_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_hole(node, session)


def _hole_wizard_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_hole(node, session, wizard=True)


def _fillet_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_fillet(node, session)


def _chamfer_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_chamfer(node, session)


def _shell_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_shell(node, session)


def _linear_pattern_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_linear_pattern(node, session, _execute_node)


def _mirror_pattern_executor(node: FeaturePlanNode, session: ExecutionSession, sketch: dict[str, Any] | None) -> FeatureResult:
    del sketch
    return _execute_mirror_pattern(node, session)


EXECUTORS: dict[str, ExecutorFunction] = {
    "reference_plane": _reference_plane_executor,
    "reference_axis": _reference_axis_executor,
    "sphere_add": _sphere_executor,
    "box_add": _box_executor,
    "cylinder_add": _cylinder_executor,
    "thread_add": _thread_executor,
    "thread_cut": _thread_executor,
    "bend_add": _bend_executor,
    "gear_add": _gear_executor,
    "rack_add": _rack_executor,
    "extrude_add_blind": _primary_executor,
    "extrude_add_blind_with_hole": _primary_executor,
    "extrude_add_two_sided": _primary_executor,
    "extrude_cut_blind": _primary_executor,
    "extrude_cut_two_sided": _primary_executor,
    "extrude_cut_through": _primary_executor,
    "extrude_from_face": lambda node, session, _sketch: _execute_extrude_from_face(node, session),
    "loft_add": _loft_executor,
    "loft_add_with_cap_face": _loft_cap_face_executor,
    "sweep_add": _sweep_executor,
    "revolve_add": _primary_executor,
    "revolve_cut": _primary_executor,
    "revolve_surface": _revolve_surface_executor,
    "extrude_surface": _extrude_surface_executor,
    "hole_blind": _hole_executor,
    "hole_countersink": _hole_executor,
    "hole_counterbore": _hole_executor,
    "hole_wizard": _hole_wizard_executor,
    "fillet": _fillet_executor,
    "chamfer": _chamfer_executor,
    "shell": _shell_executor,
    "boolean_bodies": lambda node, session, sketch: _execute_boolean_bodies(node, session),
    "transform_bodies": lambda node, session, sketch: _execute_transform_bodies(node, session),
    "delete_bodies": lambda node, session, sketch: _execute_delete_bodies(node, session),
    "pattern_linear": _linear_pattern_executor,
    "pattern_mirror": _mirror_pattern_executor,
    "pattern_circular": _circular_pattern_executor,
}


def analyze_cdsl(cdsl: dict[str, Any]):
    """Resolve profiles and return the current runtime capability analysis."""
    sketch_errors: dict[str, str] = {}
    resolved = resolve_required_sketches(
        deepcopy(cdsl), sketch_ids_required_by_contract(cdsl), errors=sketch_errors,
    )
    analyzer = CapabilityAnalyzer(atomic_ids=EXECUTORS, profile_types=CORE_SHAPE_GENERATORS)
    return analyzer.analyze(resolved, sketch_errors=sketch_errors)


def rebuild_cdsl(cdsl: dict[str, Any], out_step: Path, *, strict: bool = True) -> dict[str, Any]:
    """Rebuild CDSL through session-scoped atomic executors only."""
    sketch_errors: dict[str, str] = {}
    resolved = resolve_required_sketches(
        deepcopy(cdsl), sketch_ids_required_by_contract(cdsl), errors=sketch_errors,
    )
    analysis = CapabilityAnalyzer(atomic_ids=EXECUTORS, profile_types=CORE_SHAPE_GENERATORS).analyze(
        resolved, sketch_errors=sketch_errors,
    )
    if strict and not analysis.runtime_eligible:
        first = next((result for result in analysis.feature_results if not result.executable), None)
        if first is None:
            raise ValueError(analysis.document_blockers[0].code)
        if any(blocker.code == "unknown_atomic" for blocker in first.blockers):
            raise ValueError(f"unsupported atomic_id: {first.atomic_id}")
        detail = "; ".join(blocker.code for blocker in first.blockers)
        raise ValueError(f"Feature {first.feature_id} is not runtime eligible: {detail}")
    session = ExecutionSession(
        sketches={str(sketch.get("id")): sketch for sketch in (resolved.get("geometry") or {}).get("sketches") or []},
        nodes={node.feature_id: node for node in analysis.plan},
    )
    diagnostics: list[RuntimeDiagnostic] = []
    for node, preflight in zip(analysis.plan, analysis.feature_results):
        if not preflight.executable:
            diagnostics.extend(preflight.blockers)
            if strict:
                break
            continue
        try:
            _execute_node(node, session)
        except Exception as error:
            failed_resolution = next(
                (item for item in reversed(session.selector_resolutions) if item["status"] != "resolved"), None,
            )
            diagnostic = (
                RuntimeDiagnostic(error.code, str(error), feature_id=node.feature_id, detail=error.detail)
                if isinstance(error, FeatureExecutionError)
                else
                RuntimeDiagnostic(
                    failed_resolution["diagnostic"]["code"], failed_resolution["diagnostic"]["message"],
                    feature_id=node.feature_id, detail=failed_resolution["diagnostic"].get("detail") or {},
                )
                if failed_resolution and failed_resolution.get("diagnostic")
                else RuntimeDiagnostic("execution_failed", str(error), feature_id=node.feature_id)
            )
            diagnostics.append(diagnostic)
            if strict:
                raise RuntimeExecutionError(diagnostic, list(session.selector_resolutions)) from error
    output = session.body
    surface_geometry: dict[str, Any] | None = None
    if output is None:
        if not session.surface_members:
            raise ValueError("CDSL execution produced no body")
        # 纯曲面文档没有 active solid，但依然是可执行的 CAD 结果。只有在
        # 没有实体时才将 surface members 作为 STEP 输出，混合模型继续只导出
        # 实体，避免曲面意外改变既有实体比较和下游消费语义。
        output = session.adapter.combine_surfaces(*session.surface_members.values())
        surface_geometry = session.adapter.surface_geometry(output)
    out_step.parent.mkdir(parents=True, exist_ok=True)
    session.adapter.export(output, str(out_step))
    geometry = session.adapter.body_geometry(session.body) if session.body is not None else surface_geometry
    if geometry is None:
        raise ValueError("CDSL execution produced no exportable geometry")
    bbox = geometry["bbox_mm"]
    return {
        "engine": "cdsl_session_runtime",
        "out_step": str(out_step),
        "volume_mm3": float(geometry.get("volume_mm3") or 0.0),
        "bbox_mm": {"min": bbox[:3], "max": bbox[3:]},
        # #7 multi-body：重建结果里的独立实体数（Compound 成员数），
        # 与 batch 验证的 document_truth.geometry.solid_body_count 对齐。
        "solid_count": len(session.adapter.body_solids(session.body)) if session.body is not None else 0,
        "surface_count": len(session.surface_members),
        "surface_face_count": int(surface_geometry["face_count"]) if surface_geometry is not None else 0,
        "surface_area_mm2": float(surface_geometry["area_mm2"]) if surface_geometry is not None else 0.0,
        "feature_results": [result.as_dict() for result in session.results.values()],
        "runtime_diagnostics": [diagnostic.as_dict() for diagnostic in diagnostics],
        "topology_records": [record.public_dict() for record in session.topology.records()],
        "topology_deltas": list(session.topology.topology_deltas()),
        "selector_resolution": session.selector_resolutions,
    }