fix: require Python >=3.11 (stdlib tomllib) — green CI, 0.2.1

[collincusce]

The failure

CI went red on the Python 3.10 matrix leg only:

ModuleNotFoundError: No module named 'tomllib'

tomllib is stdlib since Python 3.11. config.py and profiles/detect.py import it, but pyproject.toml claimed requires-python = ">=3.10" and CI tested 3.10 — so 3.10 never actually worked (it passed locally only because the dev box is 3.11). 3.11–3.13 are green.

The fix

Require Python ≥ 3.11 — the honest, lean fix that keeps the zero-runtime-dependency promise (the alternative, a tomli backport, would add a dep just to support an EOL-approaching minor).

• requires-python = ">=3.11", drop the 3.10 classifier
• CI matrix → ["3.11", "3.12", "3.13"]
• Bump to 0.2.1 + CHANGELOG (the published 0.2.0 advertises 3.10 but crashes there)

Verified

• uv build → 0.2.1, wheel metadata shows Requires-Python: >=3.11
• twine check PASSED on both artifacts
• 72 tests pass

After merge, CI should be green. To correct the published metadata on PyPI (0.2.0 is immutable and still claims 3.10), cut a v0.2.1 GitHub Release — publish.yml will ship it automatically.

🤖 Generated with Claude Code

https://claude.ai/code/session_01HiQppNdrQhiZ5vwMEdSCzT

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