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fix: hydrate durable registry snapshots before serving writes

#244

Merged chris wants to merge codex/wildloop-registry-rollout into main

11 files +202 -35

25f4058712 test: protect registry snapshots from unavailable reads Chris Breuer review this step
e8f731f5cf fix: require registry snapshot hydration before writes Chris Breuer review this step
5895391ce3 test: reproduce partial build status hydration overwrites Chris Breuer review this step
4adf7432d5 fix: gate build status snapshots on applied state Chris Breuer review this step