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- Add EdgeTTSAdapter to bin/deepdive_tts.py (provider key: "edge-tts") default voice: en-US-GuyNeural, no API key required - Add EdgeTTS class to intelligence/deepdive/tts_engine.py - Update HybridTTS to try edge-tts as fallback between piper and elevenlabs - Add --voice-memo flag to bin/night_watch.py for spoken nightly reports - Add edge-tts>=6.1.9 to requirements.txt - Create docs/voice-output.md documenting all providers and fallback chain - Add tests/test_edge_tts.py with 17 unit tests (all mocked, no network) Fixes #1126 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>