refactor(cdsl_engine): sink atomic runtime capability flags into schema contracts

Phase 4 of the decoupling refactor (behavior-preserving):
- profile_schema.json: every operation contract now carries
  runtime_capability {body_mutating, requires_active_body,
  replayable, requires_selector, open_profile_ok} (single source of truth)
- operation_contracts.py: validates and forwards the flags
- capabilities.py: the five data-classification frozensets are now
  derived from the schema at import time; dispatch-logic sets
  (_HOLE_ATOMICS, _PATTERN_ATOMICS, extent constants) stay in code
- test_profile_schema.py: completeness + structural invariants test

Equivalence proven by flag counts (27/13/25/6/2) matching the previous
hand-written sets and by the unchanged test-baseline failure set.

backend/engine/cdsl_engine/capabilities.py

@@ -19,31 +19,8 @@ from .runtime_types import (
 from .operation_contracts import materialized_feature_contracts
 
 
-_SELECTOR_REQUIRED = frozenset({"extrude_add_blind_with_hole", "extrude_from_face", "loft_add_with_cap_face", "fillet", "chamfer", "shell"})
 _SKETCH_ATOM_PREFIXES = ("extrude_", "revolve_", "sweep_")
-# 开放轮廓（closed=false / role=open）只有"刀具截面补槽口边闭合后作切除"的
-# 物理意义：仅 extrude 直切类原子支持；add/回转对开放轮廓会造出无意义的封块。
-_OPEN_PROFILE_ATOMICS = frozenset({"extrude_cut_blind", "extrude_cut_through"})
-_PRIMARY_ATOMICS = frozenset({
-    "extrude_add_blind", "extrude_add_blind_with_hole", "extrude_add_two_sided", "extrude_cut_blind", "extrude_cut_two_sided", "extrude_from_face", "extrude_surface",
-    "extrude_cut_through",
-    "revolve_add", "revolve_cut", "revolve_surface", "hole_blind", "hole_countersink",
-    "hole_counterbore", "sphere_add", "box_add", "cylinder_add",
-})
 _HOLE_ATOMICS = frozenset({"hole_blind", "hole_countersink", "hole_counterbore", "hole_wizard"})
-_ACTIVE_BODY_REQUIRED = frozenset({
-    "extrude_cut_blind", "extrude_cut_two_sided", "extrude_cut_through",
-    "loft_add_with_cap_face", "revolve_cut", *_HOLE_ATOMICS, "fillet", "chamfer", "shell",
-    # thread_cut 是 cut 型特征：必须在已有主体（宿主）上做布尔差，不能凭空
-    # 造实体；无宿主时按 active_body 前置阻止而非让 executor 在 None 上崩溃。
-    "thread_cut",
-})
-_BODY_MUTATING_ATOMICS = frozenset({
-    "extrude_add_blind", "extrude_add_blind_with_hole", "extrude_add_two_sided", "extrude_cut_blind", "extrude_cut_two_sided", "extrude_from_face",
-    "extrude_cut_through", "loft_add", "loft_add_with_cap_face", "sweep_add",
-    "revolve_add", "revolve_cut", "sphere_add", "box_add", "cylinder_add",
-    "thread_add", "thread_cut", "bend_add", "gear_add", "rack_add", *_HOLE_ATOMICS, "fillet", "chamfer", "shell",
-})
 # ``ExecutionSession.body_members`` only contains independently selectable
 # body outputs.  A normal additive/cut/dress-up feature replaces the active
 # aggregate, while ``result_mode: new_body`` and ``keep_tools`` are the two
@@ -51,14 +28,6 @@ _BODY_MUTATING_ATOMICS = frozenset({
 # members can additionally expose a proven COPY instance; replayed/fused
 # patterns remain ineligible because no exact instance ownership exists.
 _PATTERN_ATOMICS = frozenset({"pattern_linear", "pattern_mirror", "pattern_circular"})
-# A pattern may replay a previous pattern as well as a direct body mutation.
-# Context-only features have no geometry definition to instance.  thread_add,
-# thread_cut, bend_add, gear_add and rack_add are excluded: pattern
-# translation does not yet move their parametric axis/frame, so a replayed
-# instance would silently re-run at the original location.
-_REPLAYABLE_ATOMICS = (
-    _BODY_MUTATING_ATOMICS - frozenset({"thread_add", "thread_cut", "bend_add", "gear_add", "rack_add"})
-) | frozenset({"pattern_linear", "pattern_mirror", "pattern_circular"})
 _SUPPORTED_EXTENTS = frozenset({
     "blind", "mid_plane", "through_all", "through_all_both", "through_all_and_blind",
     "up_to_surface", "up_to_vertex", "offset_from_surface", "through_next", "up_to_body",
@@ -71,6 +40,39 @@ _EXTENT_TARGET_KINDS = {
 }
 
 
+def _runtime_capabilities() -> dict[str, dict[str, bool]]:
+    """Return the per-atomic runtime capability flags from the schema registry.
+
+    ``profile_schema.json.operation_contracts[*].runtime_capability`` is the
+    single source of truth for these classifications.  Adding an atomic
+    operation updates one JSON contract instead of editing code-level sets.
+    """
+    path = Path(__file__).with_name("profile_schema.json")
+    contracts = materialized_feature_contracts(json.loads(path.read_text(encoding="utf-8")))
+    return {atomic_id: contract["runtime_capability"] for atomic_id, contract in contracts.items()}
+
+
+_RUNTIME_CAPABILITIES = _runtime_capabilities()
+_SELECTOR_REQUIRED = frozenset(a for a, c in _RUNTIME_CAPABILITIES.items() if c["requires_selector"])
+# 开放轮廓（closed=false / role=open）只有"刀具截面补槽口边闭合后作切除"的
+# 物理意义：仅 extrude 直切类原子支持；add/回转对开放轮廓会造出无意义的封块。
+_OPEN_PROFILE_ATOMICS = frozenset(a for a, c in _RUNTIME_CAPABILITIES.items() if c["open_profile_ok"])
+_PRIMARY_ATOMICS = frozenset({
+    "extrude_add_blind", "extrude_add_blind_with_hole", "extrude_add_two_sided", "extrude_cut_blind", "extrude_cut_two_sided", "extrude_from_face", "extrude_surface",
+    "extrude_cut_through",
+    "revolve_add", "revolve_cut", "revolve_surface", "hole_blind", "hole_countersink",
+    "hole_counterbore", "sphere_add", "box_add", "cylinder_add",
+})
+_ACTIVE_BODY_REQUIRED = frozenset(a for a, c in _RUNTIME_CAPABILITIES.items() if c["requires_active_body"])
+_BODY_MUTATING_ATOMICS = frozenset(a for a, c in _RUNTIME_CAPABILITIES.items() if c["body_mutating"])
+# A pattern may replay a previous pattern as well as a direct body mutation.
+# Context-only features have no geometry definition to instance.  thread_add,
+# thread_cut, bend_add, gear_add and rack_add are excluded: pattern
+# translation does not yet move their parametric axis/frame, so a replayed
+# instance would silently re-run at the original location.
+_REPLAYABLE_ATOMICS = frozenset(a for a, c in _RUNTIME_CAPABILITIES.items() if c["replayable"])
+
+
 def _mappings(value: Any):
     """Yield nested feature mappings for capability-only contract checks."""
     if isinstance(value, dict):