Demonstrates client-side auto-reconnect for the SSE polling pattern (SEP-1699).

• Connects to SSE polling demo server
• Automatically reconnects when server closes SSE stream
• Resumes from Last-Event-ID to avoid missing messages
• Respects server-provided retry interval

# First start the server:
uv run mcp-sse-polling-demo --port 3000

# Then run this client:
uv run mcp-sse-polling-client --url http://localhost:3000/mcp

# Custom options:
uv run mcp-sse-polling-client --url http://localhost:3000/mcp --items 20 --checkpoint-every 5

• --url: Server URL (default: http://localhost:3000/mcp)
• --items: Number of items to process (default: 10)
• --checkpoint-every: Checkpoint interval (default: 3)
• --log-level: Logging level (default: DEBUG)