No confidence field exists anywhere in scene/incident data, so the alerter
derives one: match weight (talkgroup 1.0, extracted tag 0.8, raw transcript
0.6) scaled down only when stt_confidence is under ALERT_STT_REFERENCE (0.3),
zero for not_speech. Below ALERT_MIN_CONFIDENCE, or high severity (term list,
or a major incident) without ALERT_CORROBORATION_MIN_CALLS calls or
ALERT_HIGH_SEVERITY_MIN_CONFIDENCE, the match is written to alert_holds
(no Firestore rule, admin-only GET /alerts/held) and logged instead of pushed.
A needs_corroboration hold is released when a later call brings its incident
to the call minimum; a rule pushed by that call supersedes its hold.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Logan CusanoandClaude Opus 5.5
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