FE-1580: Port omitted Voice settlement behavior - #9588

Summary

• Release canonical Voice ownership when an authorized completed Realtime response contains no audio, while preserving unrelated active playback.
• Settle a completed, correlated Brunch submission even when it contains no canonical prose, so the next Voice turn can begin.
• Keep a rejected durable Stop visible as an error after late provider completion and prevent deferred tools or continuation from resuming.
• Remove the stale browser brunch_ask catalog entry without restoring the temporary shim.
• Update the Mission 6b authority and existing changeset for the current-main follow-up.

Regression coverage

• Silent terminal response releases only its matching speech request and restores capture.
• Active audio remains owned until buffer stop even if terminal metadata omits audio.
• Zero-segment completed Brunch turns settle and accept the next transcript.
• A queued silent response does not interrupt unrelated playback.
• Late provider completion cannot turn a failed durable Stop into success or run withheld work.
• The production preview no longer registers brunch_ask.
• Test teardown removes module-global toast state deterministically.

Verification

• @apps/petrinaut-website: 5 affected files, 146 tests passed.
• @hashintel/petrinaut: assistant panel file, 60 tests passed.
• TypeScript checks passed for both affected workspaces.
• ESLint passed with one existing warning in unchanged voice-interview-control.tsx.
• Changed-file formatting, markdown lint, architecture lint, both affected builds, and git diff --check passed.

Scope

This does not include #9538 grounding/preview behavior, #9550 interruption or VAD changes, the snapshot-overlay defect, or the dual-rejection provenance rollback. No paid-provider, microphone, or audible-latency claim is made.

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