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Documentation drift checks

Two complementary checks help keep docs/ in sync with the codebase.

1. script/check_docs_references.py (wired into prek)

Runs on every commit that touches docs/*.md or aiohomematic/central/events/*.py via the check-docs-references prek hook. What it verifies:

  1. Broken relative links — every [text](path.md) / [text](path.md#anchor) link in docs/ must resolve to an existing file. Code fences are stripped before matching so Python type annotations like Callable[P, R] do not register as links.
  2. Stale identifiers — known-renamed classes and paths (e.g. XmlRpcProxy → AioXmlRpcProxy, aiohomematic/caches/ → aiohomematic/store/) must not appear in prose. Extend the STALE_PATTERNS table at the top of the script when the codebase is refactored.
  3. Event reference coverage — every public Event subclass exported from aiohomematic/central/events/__init__.py (__all__) must appear at least once in docs/architecture/events/event_reference.md. Adding a new event without updating the reference fails the check.

Running manually

python script/check_docs_references.py

Exit code is 0 when clean, 1 when drift is detected.

When the check fires

  • Broken link: update the link target, or delete the link if the target was removed intentionally.
  • Stale identifier: update the prose. Extend STALE_PATTERNS only if the rename must be enforced project-wide.
  • Missing event class: add at least a Quick Reference row and a per-event section to docs/architecture/events/event_reference.md. Follow the existing format (field table, **Key:** …, and a link to the relevant ADR where applicable).

2. pytest-markdown-docs (proposed, not yet enforced)

The Quick Start and Getting Started pages contain executable Python snippets. A natural next step is to run them through pytest-markdown-docs so that broken snippets fail CI like any other test. Suggested minimal wiring:

# pyproject.toml (excerpt — not yet committed)
[tool.pytest.ini_options]
markdown-docs-syntax = "superfences"
addopts = "--markdown-docs"

pip install pytest-markdown-docs
pytest --markdown-docs docs/quickstart.md docs/getting_started.md

This is not currently wired into CI. Tracking in the contributor guide so we can enable it once the snippets are fully stable.

3. Version stamps in docs (policy)

Manual **Last Updated**: YYYY-MM-DD footers are not maintained in the documentation. They drift silently after the next edit. Use git when you need the real mtime:

git log -1 --format=%cs -- docs/architecture.md