ci: use native uv integration in RTD

[shenanigansd]

ref: https://about.readthedocs.com/blog/2026/04/uv-native-support/

[codspeed-hq]

Merging this PR will improve performance by 14.17%

⚡ 1 improved benchmark
✅ 1 untouched benchmark

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_stutter[0.0-cats are small-cats are small]	133.7 µs	117.1 µs	+14.17%

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_{Comparing shenanigansd-patch-1 (5411b93) with main (2b61681)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.29%. Comparing base (2b61681) to head (5411b93).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #150   +/-   ##
=======================================
  Coverage   88.29%   88.29%           
=======================================
  Files           3        3           
  Lines          94       94           
=======================================
  Hits           83       83           
  Misses         11       11           

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[Copilot]

Pull request overview

Updates the Read the Docs build configuration to use RTD’s native uv integration for installing documentation dependencies, aligning the docs build with the repo’s uv.lock + dependency-groups setup.

Changes:

• Remove custom build.jobs.install pip commands from RTD config.
• Configure RTD to run uv sync and install the docs dependency group via python.install.
• Keep Sphinx configuration pointing at docs/conf.py.

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