enhance: expose element-generation readiness on native knowledge graphs

[jabbadizzleCode]

Summary

Exposes whether the canonical native knowledge graph is ready for generated Klicker elements.

• derives readiness from the existing KBGraphBuild
• requires a successful build and a complete immutable generation bundle
• checks the pinned container, build-specific prefix, storage name, bundle digest, graph digest, manifest schema, and manifest coordinate
• surfaces readiness through the existing knowledge-graph configuration query
• removes assumptions tied to the superseded parallel graph-version model

Stack

1. #5383 — native graph-bundle and generation ledger foundation
2. #5384 — unified Klicker element generation API
3. #5385 — unified Klicker element generation UI
4. This PR: enhance: expose element-generation readiness on native knowledge graphs #5397 — native graph readiness for element generation
5. #5398 — native graph-to-generation handoff

Branch coverage

• Base: feat/question-generation-ui at 32be128ca
• Head: 59388a70c
• Diff: one commit

Verification

• readiness unit coverage passed for every required native bundle field and status condition
• GraphQL schema/code generation and TypeScript checks passed
• final-stack focused verification passed: 162 GraphQL tests and 56 Hatchet KB tests
• full final-stack production pre-push build passed before branch publication
• git diff --check origin/v3-ai..HEAD passed

This PR does not add graph correction/version UI or a second graph lifecycle. Richer correction and graph-policy behavior should be designed separately against the native KBGraphBuild model.

No deployment is included.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud