Add formatSrt/formatVtt/wordsToCues to normalize.ts (the inverse of the
existing parseSrt/parseVtt) and a 'hyperframes transcribe <transcript> --to
srt|vtt' export mode. Word-level whisper transcripts group into cues on
sentence boundaries with maxChars/maxGap guards; imported phrase-level cues
pass through unchanged. Default transcribe behavior is unchanged and no new
dependencies are added.
Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
transcribe hard-failed with cli_error whenever whisper-cpp was absent. On
Linux/Docker/CI (no Homebrew, no compiler toolchain) that is unavoidable, so it
drove ~30k cli_error/day that are really "install the prerequisite" rather than
bugs — and buried genuine transcription failures in the command-error budget.
ensureWhisper now throws a typed WhisperUnavailableError when no binary exists
and none can be built. The transcribe command reports that on a dedicated
transcribe_unavailable metric instead of cli_error, and a new --optional flag
lets pipelines skip captions and exit 0. Real transcription crashes still fail
as cli_error. init and the skill pipelines already continue without captions.
Also removes a stale doc reference to a `transcribe --provider groq` flag that
does not exist.
