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Adds chat_context_resources: a per-chat pinned copy of the agent context resources a chat is hydrated against. The agent-side table (workspace_agent_context_resources) is last-writer-wins with no history, so a chat copies its resources at hydration/refresh to keep a stable view while the agent drifts. Schema foundation only (no queries/dbauthz/prepareGeneration/SDK yet). chat_id FK ON DELETE CASCADE for cleanup parity; no agent FK so the pin survives agent replacement; PK (chat_id, source); reuses the 000522 enum types.