chore: aspirational-ticket gate + INVARIANTS marker convention #68

Job	Run time
Pre-commit	1m 8s
File length	8s
Coverage	25s
Version bump check	8s
Unit tests	21s
Architecture (import-linter)	12s
Lint & Format	12s
Type Check	21s
Frontend Build	17s
Tests required	7s
Action pinning audit	6s
Frontend Quality	16s
Branch-protection contexts sync	18s
src/ README audit	8s
Aspirational ticket cite	5s
Commit-type sync	9s
	4m 21s

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