fix(knowledge): skip global readiness checks for ordinary KBs

[TheodoreSpeaks]

Summary

• Ordinary KB vector searches can exhaust their retrieval deadline while waiting on a global projection-readiness check. Skip that probe unless every searched KB is a Sim Search index.
• Retain document-backed identity reads and permission checks for ordinary KBs, and preserve the existing Sim Search path. Cover both paths with retrieval, denied-source, and deadline tests.

Type of Change

• Bug fix

Testing

• 199 focused tests passed across search queries, ACL predicates, and the search application use case.
• All 3 PostgreSQL KB block integration tests passed locally, including 18 concurrent searches with and without tag filters. Assertions verify zero global readiness probes and document-backed page reads.
• App type-check and repository-wide lint passed.
• All 47 repository audits, the staging block-registry check, and docs-manifest check passed.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 23, 2026 11:49pm UTC

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the new branch preserves authorization behavior while removing the problematic global readiness query from ordinary KB searches.

Summary

This PR prevents ordinary knowledge-base vector searches from spending their retrieval deadline on the global projection-readiness probe while preserving the existing Sim Search behavior.

• Adds searchIndexOnly to distinguish all-Sim-Search requests from ordinary or mixed KB searches.
• Uses the readiness probe only for all-Sim-Search requests.
• Keeps ordinary KB candidate authorization and denied-source handling document-backed.
• Expands retrieval, deadline, and denied-source coverage for both paths.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Vector knowledge search] --> B{Every KB is a Sim Search index?}
  B -->|Yes| C[Check global projection readiness]
  C --> D{Projection filled?}
  D -->|Yes| E[Use projected on-row identity path]
  D -->|No| F[Use document-backed identity path]
  B -->|No| F
  E --> G[Rank, authorize, and hydrate results]
  F --> G

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