Tests

Cross-platform CI matrix, Windows path tests, and PyInstaller smoke t… #97

Job	Run time
Secret scan (gitleaks)	4s
Lock file freshness	17s
Typecheck (mypy)	17s
Unit tests (ubuntu-latest / Python 3.12)	16s
Unit tests (windows-latest / Python 3.13)	41s
Unit tests (windows-latest / Python 3.10)	39s
Unit tests (windows-latest / Python 3.12)	1m 11s
Unit tests (macos-latest / Python 3.13)	16s
Unit tests (macos-latest / Python 3.11)	14s
Unit tests (ubuntu-latest / Python 3.11)	17s
Unit tests (ubuntu-latest / Python 3.10)	13s
Unit tests (ubuntu-latest / Python 3.13)	18s
Unit tests (macos-latest / Python 3.10)	30s
Unit tests (windows-latest / Python 3.11)	44s
Unit tests (macos-latest / Python 3.12)	13s
	6m 10s

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