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feat(dev): complete P02d-7 demo and phase-exit enforcement #178

Job	Run time
backend (build + unit + arch + contract)	3m 24s
backend integration (Testcontainers)	13m 23s
secret scan (leakwatch)	1m 11s
openapi diff	16s
meta (compose + commit hygiene + link audit)	11s
frontend (typecheck + lint + build + test)	2m 40s
public demo + lighthouse	14m 9s
	35m 14s