chore: src/ README audit gate + 5 package READMEs #66

Job	Run time
Type Check	21s
Lint & Format	10s
Coverage	32s
Pre-commit	1m 3s
Action pinning audit	7s
Version bump check	8s
Architecture (import-linter)	9s
File length	6s
Unit tests	23s
Commit-type sync	11s
Tests required	5s
src/ README audit	9s
Frontend Quality	17s
Branch-protection contexts sync	11s
Frontend Build	15s
	4m 7s

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