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feat(education): complete P02d-2 authoring and convergent seed #133

Job	Run time
backend (build + unit + arch + contract)	2m 22s
frontend (typecheck + lint + build + test)	56s
secret scan (leakwatch)	46s
backend integration (Testcontainers)	6m 48s
meta (compose + commit hygiene + link audit)	12s
openapi diff (deferred to Phase 02d)	0s
lighthouse budget (deferred to Phase 02d)	-1s
	11m 3s