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feat(events): complete P02b-1 transactional event production #185

Job	Run time
backend (build + unit + arch + contract)	3m 33s
frontend (typecheck + lint + build + test)	2m 52s
backend integration (Testcontainers)	12m 3s
openapi diff	18s
public demo + lighthouse	14m 11s
meta (compose + commit hygiene + link audit)	14s
secret scan (leakwatch)	58s
	34m 9s