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docs(roadmap): turn Phase 02b from a diagnosis into a gated plan #118

Job	Run time
frontend (typecheck + lint + build + test)	52s
backend integration (Testcontainers)	1m 34s
backend (build + unit + arch + contract)	2m 40s
secret scan (leakwatch)	1m 7s
meta (compose + commit hygiene + link audit)	6s
lighthouse budget (deferred to Phase 02d)	-1s
openapi diff (deferred to Phase 02d)	-1s
	6m 17s