Fix #13: AI Transcription Tool

[jialfaro]

Added a new comprehensive guide file guides/20260905_guide_ai_transcription_with_sapat.md covering Sapat-based transcription workflows. The guide includes: detailed ffmpeg preprocessing commands, chunking and VAD strategies, provider tradeoffs (OpenAI, Groq, cloud STT, local Whisper), Sapat integration patterns, postprocessing (punctuation, NER), diarization, scaling, cost controls, Whisper deep dive, evaluation metrics, troubleshooting, and Daytona workspace tips. File created and ready for PR. /claim #13

PR Title suggestion: "/claim #13: AI Transcription with Sapat — OpenAI, Groq, Whisper guide"

PR Body suggestion:

• Closes AI Transcription Tool #13
• Summary: Add long-form Daytona-style guide documenting how to use Sapat for transcription, provider tradeoffs, ffmpeg preprocessing, Whisper details, diarization, batching, cost/ops guidance, and Daytona workspace recommendations.
• Verification: New markdown added at guides/20260905_guide_ai_transcription_with_sapat.md. Run npx markdownlint to lint. (Commands executed: created file in repo.)

Resolvable: true

Closes #13

/claim #13