Tests

Tighten Bubble boundary with typed accessors #292

Job	Run time
Lock file freshness	11s
Secret scan (gitleaks)	5s
Typecheck (mypy)	22s
Unit tests (windows-latest / Python 3.12)	1m 36s
Unit tests (macos-latest / Python 3.13)	18s
Unit tests (macos-latest / Python 3.10)	35s
Unit tests (ubuntu-latest / Python 3.13)	28s
Unit tests (ubuntu-latest / Python 3.11)	20s
Unit tests (windows-latest / Python 3.10)	1m 6s
Unit tests (ubuntu-latest / Python 3.12)	27s
Unit tests (windows-latest / Python 3.11)	1m 4s
Unit tests (windows-latest / Python 3.13)	1m 2s
Unit tests (macos-latest / Python 3.12)	31s
Unit tests (ubuntu-latest / Python 3.10)	38s
Unit tests (macos-latest / Python 3.11)	27s
Performance benchmarks (gated)	33s
	9m 43s

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