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Phase 02a Packet 10: architecture tests green, and the phase exit #113

Job	Run time
backend (build + unit + arch + contract)	2m 34s
backend integration (Testcontainers)	1m 49s
meta (compose + commit hygiene + link audit)	9s
frontend (typecheck + lint + build + test)	55s
secret scan (leakwatch)	1m 14s
openapi diff (deferred to Phase 02d)	0s
lighthouse budget (deferred to Phase 02d)	0s
	6m 41s