feat: Add ClawdTalk voice calling skill

skills/clawdtalk/.gitignore

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+.skill.config

skills/clawdtalk/.skill.config.example

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+CLAWDTALK_WS_URL="wss://clawdtalk.com/ws/YOUR_AGENT_ID"
+CLAWDTALK_PHONE="+15551234567"

skills/clawdtalk/SKILL.md

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+---
+name: clawdtalk
+description: |
+  Give your AI agent a real phone number for voice calls and SMS.
+
+  Triggers when user mentions:
+  - "make a call", "phone call", "voice call"
+  - "send SMS", "text message"
+  - "ClawdTalk", "phone number for AI"
+---
+
+ClawdTalk gives any AI agent a real phone number with voice calling (inbound + outbound) and SMS capabilities via WebSocket. No server required - just connect and start taking calls.
+
+## Quick Usage (Already Configured)
+
+### Make an outbound call
+```bash
+source .skill.config && wscat -c "$CLAWDTALK_WS_URL" -x '{"type":"call","to":"+15551234567"}'
+```
+
+### Send an SMS
+```bash
+source .skill.config && wscat -c "$CLAWDTALK_WS_URL" -x '{"type":"sms","to":"+15551234567","body":"Hello from OpenWork!"}'
+```
+
+### Listen for inbound calls
+```bash
+source .skill.config && wscat -c "$CLAWDTALK_WS_URL"
+# Incoming call event: {"type":"call","from":"+15559876543","call_id":"..."}
+```
+
+## WebSocket Protocol
+
+Connect to your ClawdTalk WebSocket endpoint (provided after signup at https://clawdtalk.com).
+
+### Outbound Messages
+
+| Type | Fields | Description |
+|------|--------|-------------|
+| `call` | `to` (E.164) | Initiate an outbound call |
+| `sms` | `to`, `body` | Send a text message |
+| `answer` | `call_id` | Answer an incoming call |
+| `hangup` | `call_id` | End a call |
+| `audio` | `call_id`, `audio` (base64) | Send audio to call |
+| `dtmf` | `call_id`, `digits` | Send DTMF tones |
+
+### Inbound Events
+
+| Type | Fields | Description |
+|------|--------|-------------|
+| `call` | `from`, `call_id` | Incoming call |
+| `sms` | `from`, `body` | Incoming SMS |
+| `audio` | `call_id`, `audio` | Audio from call |
+| `transcription` | `call_id`, `text` | Speech-to-text |
+| `hangup` | `call_id` | Call ended |
+| `error` | `message` | Error occurred |
+
+## Using with AI Agents
+
+### Node.js Example
+```javascript
+const WebSocket = require('ws');
+const ws = new WebSocket(process.env.CLAWDTALK_WS_URL);
+
+ws.on('message', (data) => {
+  const event = JSON.parse(data);
+
+  if (event.type === 'call') {
+    // Handle inbound call - auto-answer
+    ws.send(JSON.stringify({ type: 'answer', call_id: event.call_id }));
+  }
+
+  if (event.type === 'transcription') {
+    // Process speech with your AI
+    const response = await yourAI.respond(event.text);
+    // Send TTS audio back (base64)
+    ws.send(JSON.stringify({ type: 'audio', call_id: event.call_id, audio: response.audio }));
+  }
+});
+```
+
+## Common Gotchas
+
+- Phone numbers must be in E.164 format: `+1XXXXXXXXXX`
+- WebSocket URL is per-agent, tied to your ClawdTalk account
+- Audio is base64-encoded PCM (16kHz, 16-bit, mono)
+- Inbound calls timeout if not answered within 30 seconds
+- SMS body limit: 160 characters (GSM-7) or 70 characters (UCS-2)
+
+## First-Time Setup
+
+### 1. Sign up for ClawdTalk
+Visit https://clawdtalk.com to create an account and get your agent's phone number.
+
+### 2. Get your WebSocket URL
+After signup, copy your WebSocket endpoint from the dashboard.
+
+### 3. Store credentials
+```bash
+echo 'CLAWDTALK_WS_URL="wss://clawdtalk.com/ws/YOUR_AGENT_ID"' >> skills/clawdtalk/.skill.config
+echo 'CLAWDTALK_PHONE="+15551234567"' >> skills/clawdtalk/.skill.config
+```
+
+### 4. Install wscat (for CLI usage)
+```bash
+npm install -g wscat
+```
+
+### 5. Test the connection
+```bash
+source .skill.config && wscat -c "$CLAWDTALK_WS_URL"
+```
+
+## Resources
+
+- [ClawdTalk Website](https://clawdtalk.com)
+- [GitHub Client](https://github.com/team-telnyx/clawdtalk-client)
+- [Telnyx Voice API](https://developers.telnyx.com/docs/api/v2/overview)