# Notepad

Leftovers, deferrals and things noticed in passing. Nothing here blocks a
release; the phase plan lives in the app repo at
`docs-private/reference/roadmap.md`.

## Open

- [ ] **CHORE/COVERAGE — the bound surface is inventoried from the app alone,
  but `assay` is a consumer too.** `tools/inventory.py` parses
  `app/backend` for `from OCP.<mod> import ...`, which is why
  `BRepPrimAPI_MakeSphere` is not bound: the app never builds a sphere.
  `assay/scripts/gen_flow_fixtures.py` does, so it has failed at import
  against the app's venv since the 10C cutover (2026-08-10) and nobody
  noticed — its fixtures predate the swap. Either teach `inventory.py` a
  second source root or keep a small hand-maintained addendum for
  non-app consumers, then bind what it turns up. Logged from the assay side
  in `assay/NOTEPAD.md`.

- [ ] **DOC/GIL — the STEP/IGES rationale predates OCCT 8.0's thread-safety
  contract and should cite it.** `docs/design.md`'s Inc 3 note explains why
  the XSTEP readers and writers hold the GIL. 8.0 added a contract that
  sounds like it changes this and does not: it is *one reader or writer per
  thread, default parameter set*, which is a per-instance guarantee that
  explicitly excludes mutated `Interface_Static` — and `app/backend/n3xd/
  cad/import_.py` sets `xstep.cascade.unit` process-wide. IGES read is still
  documented non-thread-safe. Releasing the GIL would also buy nothing: the
  app parses imports in a resource-bounded subprocess (`cad/import_pool.py`)
  with `import_max_concurrency = 1`. Worth a few lines so the question is
  not re-opened from the release notes alone.

- [ ] **CHORE/BUILD — `TKHelix` is compiled by the builder image but not
  linked.** `occt/Dockerfile` builds ModelingAlgorithms, so
  `libTKHelix.so.8.0.1` and the `HelixGeom_*`/`HelixBRep_*` headers are in
  the image; `CMakeLists.txt`'s toolkit list simply does not name it. One
  line plus a module whenever the thread-feature spike (roadmap 10E) wants
  it — no image rebuild.

## Closed

_None yet._