Initial import

packages/db/AGENTS.md

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+# AGENTS.md
+
+## Scope
+Applies within `packages/db`.
+
+## Responsibilities
+- Prisma schema
+- migrations
+- database-level helpers
+- shared transaction helpers
+
+## Rules
+- Database schema is the canonical model for persisted state.
+- Keep request-level and attempt-level generation data separate.
+- Keep provider key status events auditable.