Add webhook notification agent example for event-driven integration

[MayurUghade03]

Summary

This PR adds a webhook notification agent example that demonstrates event-driven integration patterns for Bindu agents. When tasks complete, the agent sends HTTP POST notifications to external systems via webhooks.

Problem Solved

Shows how to integrate Bindu agents with external systems through webhooks when tasks complete - a common production requirement for real-time notifications and system integration.

Solution

• Agent receives messages from Bindu framework
• Processes tasks and sends HTTP POST to configurable webhook endpoint
• Includes demo Flask receiver for local testing without external services
• Follows official Bindu patterns (bindufy, handler contract)
• Environment-based configuration for production deployment

Features

✅ Event-driven webhook notifications on task completion
✅ Environment-configurable endpoints (WEBHOOK_URL, WEBHOOK_TIMEOUT)
✅ Robust error handling with specific exception types
✅ Request tracking with unique UUIDs
✅ Timeout protection (configurable, default 5s)
✅ Local testing demo included (Flask receiver)
✅ Framework-agnostic pattern
✅ Production-ready code with type hints

Type of Change

• New example in examples/webhook_notification_agent/
• Documentation (comprehensive README with setup guide)

Files Added

• examples/webhook_notification_agent/agent.py - Agent implementation (~150 lines)
• examples/webhook_notification_agent/webhook_receiver_demo.py - Flask demo receiver
• examples/webhook_notification_agent/README.md - Complete documentation
• examples/webhook_notification_agent/requirements.txt - Minimal dependencies (3)

Testing Instructions

Quick Test

# 1. Install dependencies
pip install -r examples/webhook_notification_agent/requirements.txt

# 2. Terminal 1: Start webhook receiver
python examples/webhook_notification_agent/webhook_receiver_demo.py

# 3. Terminal 2: Run agent
python examples/webhook_notification_agent/agent.py

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