Persist MCP assets with Drizzle migrations

[eliteprox]

Summary

• Replace the in-memory MCP asset list (capped at 50, process-local) with Neon Postgres.
• Schema lives in Drizzle (db/schema.ts) and is applied with pnpm db:migrate — the app no longer runs CREATE/ALTER on first request.
• Queries stay parameterized and scoped by principal_id. forget_assets requires ids or all: true.

Land this before #47 so history can join stored outputs without depending on runtime DDL.

Test plan

• pnpm db:migrate against the console Neon database (empty or existing mcp_assets from the old ensureSchema path)
• run_capability with a media URL persists a row; get_recent_assets returns it after a process restart
• forget_assets without ids/all errors; all: true deletes only that principal
• pnpm typecheck / pnpm lint

[vercel]

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Project	Deployment	Actions	Updated
console	Ready	Preview	Sep 5, 2026 2:50am UTC

[eliteprox]

Closing in favor of #50 — schema and migration only, so other PRs do not have to take the store/MCP rewrite with the table.

The store rewrite stays on #47.

[eliteprox]

Superseded by #50 (schema-only).