feat: Add inbound call support with hook-based notifications

[olavl]

Summary

This PR adds full inbound call support to the callme plugin, allowing users to call Claude directly.

Changes

• MCP Server: Added logging capability to enable notifications/message (fixes "Server does not support logging" error)
• Inbound Call Flow: Answer incoming calls, play greeting, capture speech via STT, play hold message
• Hook Integration: Stop and UserPromptSubmit hooks to alert Claude about pending inbound calls
• New Config Options:
  • CALLME_TTS_MODEL - Configure TTS model (default: gpt-4o-mini-tts)
  • CALLME_INBOUND_GREETING - Customize the greeting message
  • CALLME_PHONE_PROVIDER and CALLME_NGROK_DOMAIN - Added to env passthrough

How Inbound Calls Work

1. User calls the configured phone number
2. Server answers and plays greeting ("Hello, this is Claude...")
3. STT captures user's speech
4. Server plays hold message and writes pending call info to temp file
5. Hooks detect the pending call and inject prompt to Claude
6. Claude uses continue_call to respond to the caller

Test Plan

• Inbound call answers and plays greeting
• Speech-to-text captures caller's message
• Hook notifies Claude about pending call
• continue_call sends response to caller
• Full conversation flow works (multiple turns)
• Outbound callback after task completion works

🤖 Generated with Claude Code