[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 typing-extensions markers for Python
  before 3.11 and 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 LiteralString
  import from typing, the sys.version_info branches and their empty
  stubs go, and three now-unused # NOQA: PERF203 comments are removed.
  test_random_str_sequence_self_type runs on every supported Python.
• README, CONTRIBUTING and the compatibility page 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 -n auto: 1476 passed, 3 skipped
• just build-docs, uv build
• CI

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.17%. Comparing base (76a909c) to head (549ac09).

Files with missing lines	Patch %	Lines
src/libtmux/options.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #849   +/-   ##
=======================================
  Coverage   52.17%   52.17%           
=======================================
  Files          26       26           
  Lines        3751     3751           
  Branches      747      747           
=======================================
  Hits         1957     1957           
  Misses       1490     1490           
  Partials      304      304           

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