[sequoiap]

Read the Docs now supports uv natively. .readthedocs.yaml now installs with method: uv, command: sync, using the docs dependency group. That installs PyroLab and the docs tools at the versions in uv.lock, the same environment make doc uses locally. So docs/requirements.txt, which repeated the docs group by hand, is deleted.

Other changes:

• Build image: ubuntu-22.04 → ubuntu-24.04, matching Read the Docs' uv example. Python stays at 3.11.
• README: the "Building the Docs" section said to pip install -r requirements.txt and make html in docs/, but there is no docs/Makefile. It now says make doc / make serve.

Notes:

• uv sync also installs the default dev group (pytest, mypy and so on). That's harmless, just slightly slower.
• Read the Docs runs uv sync without --locked, so a stale lock could be re-resolved during the build. CI already fails on a stale uv.lock, so that shouldn't reach master.

Verification

• I simulated the Read the Docs build locally from a clean checkout: uv sync --python 3.11 --group docs into a fresh environment, then jupyter-book config sphinx docs/, then sphinx.
  • It succeeds, with no import failures and the same warnings as the old requirements.txt build.
• The Read the Docs check on this PR is the real test. Pull-request builds were just turned on, so that check should run here.

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