docs: add concrete agent-failure example to README #92

Job	Run time
Type Check	19s
Coverage	23s
Lint & Format	9s
Pre-commit	1m 5s
Architecture (import-linter)	12s
Tests required	7s
src/ README audit	6s
Version bump check	5s
Aspirational ticket cite	5s
Unit tests	22s
Commit-type sync	10s
Frontend Build	16s
Action pinning audit	8s
Branch-protection contexts sync	10s
Frontend Quality	18s
File length	5s
	4m 0s

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