[codex] Expose query type filters

[TheLordArgus]

Summary

Exposes the existing SearchOpts.types filter on the public query operation so MCP/remote callers can request evidence-only or type-scoped retrieval directly.

Root Cause

The lower search layer already supports page-type filtering, but the public query op schema did not accept or thread a types parameter. Remote agents therefore had to retrieve all page types and filter client-side, which is both noisier and less reliable for evidence-only temporal retrieval.

Impact

Callers can now ask for queries such as types: ["source", "conversation"] and avoid mixing raw evidence with derived pages when they need source-grounded answers. The same filter is threaded through the text and image/vector query paths.

Changes

• Add types to the public query operation params.
• Validate it as a string array and pass it into hybridSearch / vector search options.
• Add a PGLite e2e regression proving a source page is returned while a same-keyword derived company page is excluded.

Validation

• bun test test/e2e/source-isolation-pglite.test.ts