Update README.md with comprehensive documentation and cleanup test files

- Added Discord & Slack notifications section with configuration guide
- Documented multiple phone numbers per workflow feature
- Updated version to 2.1.0 with full changelog
- Enhanced configuration sections for new features
- Added database structure documentation for twp_workflow_phones table
- Removed obsolete test files (test-sdk.php, test-capabilities.php, test-ajax-response.php)
- Updated plugin header with new version and repository URL

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -81,6 +81,14 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
 - **Command System**: Text commands to manage availability
 - **SMS Logging**: Complete history of all SMS interactions
 
+### 🔔 Discord & Slack Notifications
+- **Real-time Alerts**: Instant notifications to Discord channels and Slack workspaces
+- **Multiple Event Types**: Incoming calls, queue timeouts, and missed calls
+- **Rich Formatting**: Structured messages with caller info, queue details, and timestamps
+- **Webhook Integration**: Simple configuration with webhook URLs
+- **Configurable Options**: Enable/disable specific notification types
+- **Automatic Monitoring**: Background checks for queue timeout situations
+
 ### 📊 Real-time Dashboard
 - **Queue Monitor**: Live view of waiting calls
 - **Agent Status**: Track agent availability
@@ -92,9 +100,10 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
 - **Voicemail Transcription**: Automatic speech-to-text
 - **Callback System**: Offer callbacks instead of long holds
 - **Outbound Calling**: Click-to-call with proper caller ID
-- **Multiple Phone Numbers**: Support for multiple business lines
+- **Multiple Phone Numbers**: Support for multiple business lines per workflow
 - **Agent Phone Management**: Store and validate agent phone numbers
 - **Duplicate Prevention**: Ensures unique phone numbers per agent
+- **Enhanced Notifications**: Discord and Slack integration for real-time alerts
 
 ## Recent Updates
 
@@ -119,6 +128,19 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
 - **Queue Selection**: Proper queue routing based on digit selection
 - **Voice Selection**: Fixed voice dropdown persistence issues
 
+### Multiple Phone Numbers Support
+- **Workflow Enhancement**: Workflows can now be assigned to multiple phone numbers
+- **Junction Table**: New `twp_workflow_phones` table for many-to-many relationships
+- **Backward Compatibility**: Existing single-number workflows continue to work
+- **Validation Fixes**: Proper validation for multiple phone number selections
+
+### Discord & Slack Notifications
+- **Real-time Integration**: Instant notifications to Discord channels and Slack workspaces
+- **Event Monitoring**: Automated tracking of incoming calls, queue timeouts, and missed calls
+- **Rich Message Format**: Structured notifications with caller details, queue info, and timestamps
+- **Configurable Settings**: Toggle notification types and set custom webhook URLs
+- **Background Processing**: Cron-based monitoring for queue timeout alerts
+
 ## How It Works
 
 ### Call Flow
@@ -168,13 +190,13 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
 2. **In WordPress Admin**:
    - Go to **Twilio** → **Phone Numbers**
    - Verify numbers are synchronized
-   - Assign workflows to numbers
+   - Assign workflows to numbers (multiple numbers per workflow supported)
 
 ### Creating Workflows
 1. **Navigate to** Twilio → Workflows
 2. **Create New Workflow**:
    - Name your workflow
-   - Select phone number to assign
+   - Select phone numbers to assign (multiple selection supported)
    - Add steps using the builder
 
 3. **Configure Steps**:
@@ -218,6 +240,24 @@ This plugin **requires** the Twilio PHP SDK v8.7.0 to function. The plugin will
 4. **Configure Call Mode**: Browser or cell phone
 5. **Train Agents** on SMS commands and browser phone
 
+### Discord & Slack Setup
+1. **Discord Configuration**:
+   - Create a webhook URL in your Discord server settings
+   - Navigate to **Twilio** → **Settings** → **Notifications**
+   - Paste Discord webhook URL
+   - Enable desired notification types
+
+2. **Slack Configuration**:
+   - Create a webhook URL in your Slack workspace
+   - Navigate to **Twilio** → **Settings** → **Notifications**
+   - Paste Slack webhook URL
+   - Configure notification preferences
+
+3. **Notification Types**:
+   - **Incoming Calls**: Alert when calls enter queues
+   - **Queue Timeouts**: Alert when calls wait too long (configurable threshold)
+   - **Missed Calls**: Alert when calls are abandoned or timeout
+
 ## Voice Configuration
 
 ### ElevenLabs Integration
@@ -296,6 +336,7 @@ The plugin creates these tables:
 - `twp_call_queues` - Queue configurations (uses notification_number)
 - `twp_queued_calls` - Active calls in queues
 - `twp_workflows` - Call flow definitions with voice persistence
+- `twp_workflow_phones` - Junction table for multiple phone numbers per workflow
 - `twp_call_log` - Complete call history
 - `twp_sms_log` - SMS message tracking
 - `twp_voicemails` - Recordings and transcriptions
@@ -338,7 +379,15 @@ All webhooks are REST API endpoints under `/wp-json/twilio-webhook/v1/`:
 
 ## Version History
 
-### v2.0.0 (Current)
+### v2.1.0 (Current)
+- **Multiple Phone Numbers**: Workflows can now handle multiple phone numbers
+- **Discord & Slack Integration**: Real-time notifications for call events
+- **Enhanced Monitoring**: Automated queue timeout tracking and alerts
+- **Notification System**: Configurable webhook-based notifications
+- **Background Processing**: Cron jobs for timeout monitoring
+- **Database Enhancements**: New junction table for phone number relationships
+
+### v2.0.0
 - Upgraded to Twilio Voice SDK v2 for browser phone
 - Fixed queue notification_number field naming
 - Enhanced voice selection persistence