Initial release of the assemblyai-transcribe skill.

• Transcribe audio or video files using AssemblyAI via local upload or URL.
• Export transcripts in various formats: plain text, subtitles (SRT/VTT), paragraphs, or sentences.
• Supports advanced transcription options through JSON config.
• Fetch existing transcripts or export formats from a transcript ID.
• Usage instructions provided for command-line execution with Node.js.
• Requires ASSEMBLYAI_API_KEY in the environment for authentication.