style: format Python code blocks in Markdown (ruff 0.16)

[antosubash]

Unblocks the Python lint & format CI job, which is currently red on main and therefore on every open PR.

Why

ruff>=0.8 is unpinned. ruff 0.16 began formatting Python code blocks inside Markdown, a behaviour no one opted into — it arrived with a routine minor bump. CI installs ruff fresh each run, so make ci-python-lint started failing repo-wide:

74 files would be reformatted, 538 files already formatted

What changed

74 markdown files — reformatted by ruff format.

Changes are confined to ```python fences. I verified this mechanically rather than by eye: parsing both revisions with CommonMark fence rules (a closing fence is a bare backtick run ≥ the opening run, with no info string) and checking that every added/removed non-blank line falls inside a python fence.

files checked       : 74
prose lines changed : 0

The formatter mostly normalises blank lines between defs, collapses aligned trailing-comment columns, and expands compact call sites. No prose, headings, or non-Python fences are touched.

1 Python file — modules/settings/settings/contracts/accessor.py, 2 × RUF036 (None not at the end of a type union), from the same ruff bump:

-        user_id: str | None | _Unset = _UNSET,
-        tenant_id: str | None | _Unset = _UNSET,
+        user_id: str | _Unset | None = _UNSET,
+        tenant_id: str | _Unset | None = _UNSET,

These fail the same lint job independently, so the job stays red without them. Annotation order only — unions are order-independent, and the runtime isinstance(user_id, _Unset) dispatch is unchanged.

Verification

Check	Result
ruff format --check .	612 files already formatted
ruff check .	All checks passed
ty check	All checks passed
pytest modules/settings	112 passed

Note on scope

Deliberately split out of #232 (perf) rather than folded in — that PR is a scoped performance change, and 74 files of formatter churn would have swamped its diff. Fixing it here on main also clears it for every other open branch, not just that one.

Considered and rejected: excluding *.md via [tool.ruff.format] exclude, and pinning ruff<0.16. The pin only defers the same 74 files to whoever lifts it.

https://claude.ai/code/session_01TtYUkaUAJmUcCwB5QGxPqN

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