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feat(web): complete P02d-5 trusted server rendering #157

Job	Run time
backend integration (Testcontainers)	8m 50s
frontend (typecheck + lint + build + test)	2m 16s
secret scan (leakwatch)	53s
meta (compose + commit hygiene + link audit)	9s
openapi diff	19s
backend (build + unit + arch + contract)	2m 8s
lighthouse budget (deferred to P02d-7)	-1s
	14m 34s