CHANGES
- Add --transcribe-file flag to transcribe audio or video
- Add --transcribe-model flag with model listing and completion
- Add --split-media-file flag to chunk files over 25MB
- Implement OpenAI transcription using Whisper and GPT-4o Transcribe
- Integrate transcription pipeline into CLI before readability processing
- Provide zsh, bash, fish completions for new transcription flags
- Validate media extensions and enforce 25MB upload limits
- Update README with release and corrected pattern link path
