feat(sdk): expose WebSocket configuration for Polymarket and Kalshi

Adds websocket config parameter to both TypeScript and Python SDKs:

Polymarket:
- TypeScript: PolymarketOptions.websocket
- Python: websocket dict parameter (auto-generated)

Kalshi:
- TypeScript: KalshiOptions.websocket
- Python: websocket dict parameter (auto-generated)

Supported websocket options:
- wsUrl: Custom WebSocket endpoint
- reconnectInterval: Reconnection delay (ms)
- pingInterval: Heartbeat interval (ms)
- maxReconnectAttempts: Maximum reconnection tries

Files Changed:
- core/scripts/generate-python-exchanges.js - Generator template
- sdks/python/pmxt/client.py - Exchange base class
- sdks/python/pmxt/_exchanges.py - Generated exchange classes
- sdks/python/pmxt/__init__.py - Updated imports
- sdks/typescript/pmxt/client.ts - TypeScript interfaces

Testing:
✅ TypeScript SDK builds and works
✅ Python SDK imports and works
✅ Both exchanges accept websocket config
✅ All tests passed

Fixes #1052
Fixes #1053

Author: AbhilashG12

core/scripts/generate-python-exchanges.js

@@ -173,9 +173,11 @@ function generateClass(exchange) {
     constructorParams.push('base_url: Optional[str] = None');
     constructorParams.push('auto_start_server: Optional[bool] = None');
     constructorParams.push('pmxt_api_key: Optional[str] = None');
+    constructorParams.push('websocket: Optional[dict] = None');
     superArgs.push('base_url=base_url');
     superArgs.push('auto_start_server=auto_start_server');
     superArgs.push('pmxt_api_key=pmxt_api_key');
+    superArgs.push('websocket=websocket');
 
     const docLines = [];
     if (creds.apiKey)        docLines.push('            api_key: API key for authentication (optional)');
@@ -192,6 +194,7 @@ function generateClass(exchange) {
     docLines.push('            base_url: Base URL of the PMXT sidecar server');
     docLines.push('            auto_start_server: Automatically start server if not running (default: True)');
     docLines.push('            pmxt_api_key: Hosted PMXT API key (optional; enables hosted mode)');
+    docLines.push('            websocket: WebSocket configuration dict (optional)');
 
     const indent4 = s => `    ${s}`;
     const indent8 = s => `        ${s}`;