Tests

Lazy-load chat histories, fast list summaries, and mtime disk cache (closes #84) #171

Job	Run time
Lock file freshness	9s
Secret scan (gitleaks)	4s
Typecheck (mypy)	19s
Unit tests (windows-latest / Python 3.11)	1m 1s
Unit tests (ubuntu-latest / Python 3.12)	24s
Unit tests (ubuntu-latest / Python 3.13)	21s
Unit tests (windows-latest / Python 3.13)	1m 9s
Unit tests (windows-latest / Python 3.10)	1m 43s
Unit tests (ubuntu-latest / Python 3.11)	25s
Unit tests (macos-latest / Python 3.10)	43s
Unit tests (ubuntu-latest / Python 3.10)	24s
Unit tests (macos-latest / Python 3.13)	23s
Unit tests (macos-latest / Python 3.12)	24s
Unit tests (macos-latest / Python 3.11)	19s
Unit tests (windows-latest / Python 3.12)	2m 14s
	10m 2s

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