[tony]

Summary

Raise the Python floor from 3.10 to 3.11. Python 3.10 reached end of life
in October 2026. No release is cut.

Changes

• requires-python = ">=3.11,<4.0"; drop the 3.10 classifier; mypy and
  ruff target 3.11; drop the scripts-only py311 ruff override.
• uv.lock re-resolved with uv lock alone: the 3.10-only forks vanish
  and no package in the >=3.11 fork moves. soupsieve keeps its 2.10
  entry for Python before 3.11.5, which is a separate fork.
• ruff check --fix with the existing rules: Self and NotRequired
  import from typing, datetime.UTC, and the sys.version_info
  branch in _internal/types.py goes. TypedDict and Unpack stay on
  typing_extensions.
• AGENTS.md, README, quickstart and CONTRIBUTING state 3.11, and
  CHANGES gets a breaking-change entry.

Test plan

• ruff check, ruff format --check, mypy ., mypy --python-version 3.11 .github/scripts
• pytest .github/scripts/test_tmux_build.py --reruns=0
• py.test: 908 passed, 2 skipped
• just build-docs, uv build
• CI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.55%. Comparing base (0239dcb) to head (49109b9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1102   +/-   ##
=======================================
  Coverage   82.55%   82.55%           
=======================================
  Files          31       31           
  Lines        2769     2769           
  Branches      518      518           
=======================================
  Hits         2286     2286           
  Misses        346      346           
  Partials      137      137           

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