feat: eval harness scaffold + 1 example golden case + nightly workflow_dispatch #44

Job	Run time
Pre-commit	1m 5s
Type Check	22s
Commit-type sync	12s
Architecture (import-linter)	11s
Lint & Format	11s
Coverage	20s
Branch-protection contexts sync	11s
Unit tests	22s
Frontend Quality	19s
Frontend Build	18s
	3m 31s

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