feat: integrate SimpleCADAPI 2.0.2 CAD workflows

SimpleCADAPI/docs/api/ModelResult.md

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+# ModelResult
+
+## Class Definition
+
+```python
+@dataclass(frozen=True)
+class ModelResult:
+    value: Any
+    session: GraphSession
+    result_node_ids: Tuple[str, ...]
+    model_json: str
+    session_json: str
+    artifact_paths: Mapping[str, Path] = field(default_factory=dict)
+```
+
+*Source: graph.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import ModelResult`
+
+## Description
+
+Immutable result returned by a function decorated with `@scad.model`.
+It keeps the ordinary Python return value together with the owned session and
+the durable graph artifacts produced for that model invocation.
+
+## Attributes
+
+- `value`: The value returned by the model function. It may be a shape, a
+  product assembly, or a tuple containing application-level reports and a
+  captured preview.
+- `session`: The completed `GraphSession` that recorded the model.
+- `result_node_ids`: Explicitly captured graph node ids used as model outputs.
+- `model_json`: Canonical low-level operation graph JSON containing the captured
+  result leaves.
+- `session_json`: Session JSON containing the complete session state.
+- `artifact_paths`: Files written by automatic export. It contains the `scene`
+  key when captured geometry or product values produced a Scene ZIP.
+
+## Artifact Export
+
+```python
+result = build_model()
+exported = result.export_artifacts(output_dir="examples/out/bracket")
+print(exported.artifact_paths["scene"])
+```
+
+The same export runs automatically when `@scad.model(export_dir=...)` is used.
+Only values explicitly passed to `capture_result(...)` are considered final
+geometry/product outputs. Automatic export writes one self-contained
+`<graph_id>.scene.zip` containing the model JSON, mapped Python sources, and
+render/selection assets; it does not write adjacent model/session JSON, STEP,
+STL, or FCStd files. Without an export directory, no files are written.
+
+## Replay
+
+```python
+result = build_model()
+rebuilt = result.replay()
+```
+
+`replay()` is equivalent to replaying `result.model_json`. Pass
+`strict=False` only when intentionally relaxing replay validation.