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feat(education): implement P02d-1 schema and isolation #128

Job	Run time
backend (build + unit + arch + contract)	2m 47s
backend integration (Testcontainers)	2m 14s
frontend (typecheck + lint + build + test)	54s
secret scan (leakwatch)	1m 21s
meta (compose + commit hygiene + link audit)	9s
openapi diff (deferred to Phase 02d)	0s
lighthouse budget (deferred to Phase 02d)	0s
	7m 25s