* feat(linux): add SIGUSR1 signal for transcribe_with_post_process
Register SIGUSR1 alongside SIGUSR2 in the signal handler so Linux
users can trigger transcription with post-processing via system
signals (e.g. `pkill -SIGUSR1 -x handy`). This mirrors the existing
SIGUSR2 toggle pattern and maps to the `transcribe_with_post_process`
action already present in ACTION_MAP.
Closes#758
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* readme
* format
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: CJ Pais <cj@cjpais.com>
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