# P2.2 Document runtime gate

- Task: `FW-P2-001F`
- Time: `2026-08-19 12:42 +0800`
- Source: `4f4e9244e613ea2df06e70027074a562695048cb`
- Result: passed

## Contracts

| Contract | Evidence |
|---|---|
| Type registration | Four Part C ABI entries, one registration run |
| Document ownership | One application document, one `Part::Box`, stable names |
| Recompute | One recomputed object, volume 24, no error |
| Invalid input | `Length of box too small`; prior volume remains 24 |
| Recovery | Valid dimensions recompute to volume 24 |

## Artifacts

| Artifact | SHA-256 |
|---|---|
| `FreeCADWebPartBoxProbe.wasm` | `82c88a1f089c705454f8c62dbc4a2a0e54277073ed2e50f5a7dbb8fc5516580a` |
| `FreeCADWebDocumentProbe.wasm` | `553fe2a1c6b2a3e530e640f6cd6fece95da4c5c5395565ce17f4ef7b47bfb445` |

Both artifacts are WebAssembly MVP modules. Smoke evidence:

- `FreeCAD/docs/freecad-part-box-gate-smoke.log`
- `FreeCAD/docs/freecad-document-gate-smoke.log`

## Boundary

This gate covers the C++ `Document` and one `Part::Box` lifecycle. It does not cover FCStd, transactions, Undo/Redo, Sketcher, the Python console, or full workbench registration.