test: route-versioning audit + OTel semconv backstop tests (#130, #13… #75

Job	Run time
Lint & Format	12s
Pre-commit	1m 10s
src/ README audit	5s
Architecture (import-linter)	12s
Type Check	19s
Coverage	22s
Unit tests	25s
Frontend Build	16s
Commit-type sync	15s
Aspirational ticket cite	7s
Branch-protection contexts sync	10s
Frontend Quality	24s
File length	6s
Action pinning audit	5s
Tests required	0s
Version bump check	-1s
	4m 7s

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