Reformulated from core tool (PR #847 feedback) into a skill with a
standalone helper script. No new dependencies — uses only Python stdlib.
Two providers supported:
- Bland.ai (default): simple setup, one API key
- Vapi: flexible, better voice quality via ElevenLabs/Deepgram + Twilio
Includes:
- SKILL.md with full procedure, safety rules, provider docs, pitfalls
- scripts/phone_call.py CLI helper (call, status, diagnose commands)
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