## Why
Asynchronous score publication updated the risk score, authorization, and tool-call coverage separately. Approval checks could therefore read inconsistent evidence when deciding whether to reuse a cached score.
## What changed
Keep Guardian's cached score and observation state under one lock, and use consistent snapshots for approval checks. Publish successful scores together with their authorization and classified tool-call index. Preserve timestamp ordering, fail-closed precedence on timestamp ties, and per-call oversized-action tracking.
## Testing
Add regression coverage for rejected delayed results and timestamp ties. Add a gated integration test showing that a delayed score becomes stale after intervening tool calls, while a sufficiently fresh score permits cached approval.
GitOrigin-RevId: 8df6fafd5e0ee59aa0f78f541eac562efce3d4d0
fcf05456bb