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c3b84b96a7
Parakeet hallucinates bare punctuation ('.', '?') on non-speech audio
that clears the VAD's minimum-voiced-frames gate (12 frames / ~192 ms,
kept low to preserve short replies). Every downstream filter only
checked for emptiness, so a lone '.' was signed and posted as a real
kind:9 channel message, notifying every tagged agent.
Drop transcripts with no alphanumeric characters in send_transcript,
before they leave the STT worker. Real speech — including single-word
and non-ASCII replies — is unaffected.
Signed-off-by: Eva <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz>
Co-authored-by: Tyler <109685178+tlongwell-block@users.noreply.github.com>