Draft: batch catalog extraction for single-connection performance

[Copilot]

This work targets the single-connection catalog extraction path, where many small metadata queries add avoidable round trips and latency. The intended change is to keep the extraction code modular while allowing the catalog data to be fetched through one batched SQL execution, with timing coverage to compare both approaches.

• Performance coverage

  • Add a focused integration test that records extraction time for the current path and the batched path on the same schema setup.
  • Keep the test centered on single-connection extraction so it measures the overhead this issue is concerned with.

• Catalog extraction path

  • Introduce a batched execution mode for extractCatalog that runs one large SQL request instead of issuing many independent catalog queries.
  • Preserve separation of concerns by keeping object-specific extraction logic split by type and composing the SQL/results in a shared coordinator.

• Behavioral compatibility

  • Keep the resulting Catalog shape and normalization flow unchanged so downstream diff/planning code continues to consume the same model.

const startedAt = performance.now();
const catalog = await extractCatalog(pool);
const elapsedMs = performance.now() - startedAt;

Note: no repository changes are included yet in the current sandbox session because Bun is not installed, which blocks the required project validation commands before implementation.

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