Tests

Tighten Bubble boundary with typed accessors #284

Job	Run time
Typecheck (mypy)	15s
Secret scan (gitleaks)	6s
Unit tests (macos-latest / Python 3.12)	21s
Lock file freshness	10s
Unit tests (macos-latest / Python 3.10)	51s
Unit tests (windows-latest / Python 3.11)	1m 6s
Unit tests (ubuntu-latest / Python 3.13)	21s
Unit tests (ubuntu-latest / Python 3.12)	24s
Unit tests (ubuntu-latest / Python 3.11)	21s
Unit tests (windows-latest / Python 3.10)	1m 0s
Unit tests (ubuntu-latest / Python 3.10)	32s
Unit tests (macos-latest / Python 3.11)	24s
Unit tests (macos-latest / Python 3.13)	18s
Unit tests (windows-latest / Python 3.13)	1m 6s
Unit tests (windows-latest / Python 3.12)	2m 17s
Performance benchmarks (gated)	28s
	10m 0s

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