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feat(education): complete P02d-4 public reads and contract checks #147

Job	Run time
openapi diff	59s
backend (build + unit + arch + contract)	3m 21s
meta (compose + commit hygiene + link audit)	11s
backend integration (Testcontainers)	6m 19s
frontend (typecheck + lint + build + test)	1m 8s
secret scan (leakwatch)	1m 21s
lighthouse budget (deferred to Phase 02d)	-1s
	13m 18s