feat(governance): add source-approval + dataset-freeze contract schema (AEG-X-009, gated)
Source governance schema: append-only source_approval table enforcing approval
before ingestion. Dataset manifest hardened to support FROZEN state, requiring
approval timestamps. Boundaries tested (6/6 passing). Server-side resolver
(DapperApprovedModelContextReader) now guards both model and dataset approval.
P2–P6 deferred: Dataset freeze command, maker-checker review, evaluation/proposal
orchestration remain pending human decision package (source allow-list, license/SLA,
metric versions, roles). No source/model seeded per CLAUDE.md governance.
Migrations 0033–0034 idempotency verified fresh/upgrade/re-run on isolated test DB.
AGENTS.md: Maturity (contract-first); Necessity (governance prerequisite).
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
kjh2064
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