Whisper-stream: Add --pausable / -p — live **Pause / Resume** control

[bogdoslavik]

✨ Add --pausable / -p — live Pause / Resume control

Overview

Enabling --pausable lets you temporarily suspend and resume real-time transcription without restarting the program.

Action	Stdin command
Pause	p followed by a newline (p\n)
Resume	r followed by a newline (r\n)

The control thread reads from stdin.
Most terminals add \n automatically when you press Enter, so type p⏎ or r⏎.

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Why it matters

• Pause long sessions to save CPU/GPU and keep the transcript clean.
• Prevent residual words from the previous utterance from leaking into the next one.
• Convenient when Whisper is part of an interactive pipeline that needs on-demand control.

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Implementation details

• CLI — new flag --pausable (-p), default off (backward-compatible).
• Control thread — listens on stdin for p\n / r\n; unknown commands print a warning and are ignored.
• Pause workflow

  audio.pause();            // stop capture
  audio.clear();            // flush ring buffer
  
  pcmf32.clear();
  pcmf32_new.clear();
  pcmf32_old.clear();
  prompt_tokens.clear();
  
  whisper_reset_timings(ctx);
  t_last = std::chrono::high_resolution_clock::now();
  is_paused = true;