[shaonianche]

Python 3.15.0 shipped on 2026-10-09 (latest 3.15.2), so the support matrix should cover it.

Changes

• ci.yml: add "3.15" to the test matrix (3.9-3.15). The lint, mypy and coverage jobs stay pinned to 3.12.
• pyproject.toml: add the Programming Language :: Python :: 3.15 classifier. requires-python stays >=3.9.
• Sync the documented CI baseline in AGENTS.md, docs/RELEASING.md and docs/FIT_CONFORMANCE_DESIGN.md.
• Add news/python-315.misc.

uv.lock needs no change: it already carries python_full_version >= '3.15' resolution markers, and uv lock --check passes.

Verification

• Ran the full suite on CPython 3.15.2 after uv sync --group dev: 440 passed, 1 skipped (the Garmin JS interop test, which needs Node plus the JS SDK checkout).
• uv build wheel metadata now contains the 3.15 classifier with Requires-Python: >=3.9.
• towncrier build --draft renders the new fragment correctly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.72%. Comparing base (28fa7ae) to head (4c119c7).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   92.72%   92.72%           
=======================================
  Files          36       36           
  Lines        2721     2721           
  Branches      461      461           
=======================================
  Hits         2523     2523           
  Misses        117      117           
  Partials       81       81           

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