Tests

docs: add CHANGELOG.md and versioning policy (closes #74) (#85) #161

Job	Run time
Secret scan (gitleaks)	5s
Lock file freshness	8s
Typecheck (mypy)	19s
Unit tests (macos-latest / Python 3.13)	21s
Unit tests (ubuntu-latest / Python 3.11)	22s
Unit tests (ubuntu-latest / Python 3.13)	22s
Unit tests (ubuntu-latest / Python 3.12)	19s
Unit tests (windows-latest / Python 3.11)	55s
Unit tests (windows-latest / Python 3.10)	54s
Unit tests (macos-latest / Python 3.10)	34s
Unit tests (macos-latest / Python 3.12)	17s
Unit tests (windows-latest / Python 3.12)	1m 33s
Unit tests (ubuntu-latest / Python 3.10)	21s
Unit tests (windows-latest / Python 3.13)	1m 0s
Unit tests (macos-latest / Python 3.11)	31s
	8m 1s

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