fix: preserve negated ticket intent in audio routing

[prasithg]

Summary

• preserve explicit ticket negation before evaluating affirmative acquisition
• keep later positive purchase clauses behind human approval
• route no-buy lookup read-only, abandonment to no-op, and quoted family messages back to the normal local confirmation/no-send path
• add one diversity-reviewed metadata-only audio fixture and refresh UTC release evidence

Audio/data evidence

• 3 clearly synthetic Daniel TTS clips; 6 local Whisper tiny/base passes
• before: 0/3 bounded-oracle routes; after: 3/3
• accepted: 1 cross-family ticket-negation message fixture (diversity score 0.333, accept_review)
• rejected in Operations: 2 overlapping contrasts (ticket lookup; no-context cancel)
• repo audio Autodata: 36/36 accepted, 6 held, 1 rejection-ledger row, 27 hard negatives/no-action, 0 unsafe
• raw audio/local paths committed: 0

Safety

• no checkout or purchase path
• family message remains local and confirmation-gated; external_send=false
• later affirmative ticket purchase still requires human approval
• no private family data and no clinical claim

Verification

• backend/.venv/bin/python -m pytest backend/tests/test_textloop.py backend/tests/test_nbest_repair.py backend/tests/test_audio_autodata_evaluator.py backend/tests/test_audio_autodata_promoter.py -q — 82 passed
• TZ=UTC make eval-audio-autodata — 36/36, 0 unsafe, PASS
• TZ=UTC make eval-release-readiness — PASS, 4/4 claims, 17 assertions
• TZ=UTC make test — 631 passed, 2 pre-existing dependency warnings
• git diff --check — passed

Review note

Local independent Claude review could not run because the CLI was not authenticated. Please review negation clause scoping and the transition from purchase hold to a local confirmation-gated message before merge.