Add elevenlabs-stt skill and documentation

docs/elevenlabs-stt.md

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+# elevenlabs-stt
+
+Transcribe local audio files with ElevenLabs Speech-to-Text.
+
+## What this skill is for
+
+- Local audio transcription
+- Voice note transcription
+- Optional speaker diarization
+- Language hints and event tagging
+- JSON output for programmatic use
+
+## Requirements
+
+Required binaries:
+- `curl`
+- `jq`
+- `python3`
+
+Preferred auth:
+- `ELEVENLABS_API_KEY` in the environment
+
+Fallback auth:
+- local OpenClaw config lookup from `~/.openclaw/openclaw.json` or `~/.openclaw/secrets.json`
+
+## Wrapper
+
+Use the bundled script directly:
+
+```bash
+bash skills/elevenlabs-stt/scripts/transcribe.sh /path/to/audio.mp3
+bash skills/elevenlabs-stt/scripts/transcribe.sh /path/to/audio.mp3 --diarize --lang en
+bash skills/elevenlabs-stt/scripts/transcribe.sh /path/to/audio.mp3 --json
+bash skills/elevenlabs-stt/scripts/transcribe.sh /path/to/audio.mp3 --events
+```
+
+## Notes
+
+- Uses ElevenLabs STT model `scribe_v2`.
+- Uploads a local file directly to ElevenLabs.
+- If `ELEVENLABS_API_KEY` is not exported, the script tries local OpenClaw config/secrets automatically.