Feature request: CompanionSpeech hook event

Feature Request

Add a CompanionSpeech hook event that fires when the companion (penguin mode) displays a speech bubble.

Use Case

I'd like to give my companion a voice via TTS. The hook system already supports PreToolUse, PostToolUse, Notification, etc. — but there's no event for companion output.

With a CompanionSpeech hook, I could pipe the bubble text through a local TTS engine (Kokoro) and have the companion actually speak aloud with its own distinct voice.

Proposed Hook Shape

{
  "CompanionSpeech": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "koko-speak --voice am_puck --text \"$COMPANION_TEXT\""
        }
      ]
    }
  ]
}

The hook input would include:

• companion_text — the speech bubble content
• companion_name — e.g. "Flintcobb"

Context

The companion is a delightful UI feature. Letting users hook into its output would open up fun personalization — TTS voices, logging, notifications, etc. — using the same hook system that already exists for everything else.