Add OpenRouter support and improve JSON parsing robustness

- Add OpenRouter as third LLM provider option in config.py
- Implement _extract_json() to handle markdown-wrapped JSON responses
- Add default values for missing required fields in ScriptPlan
- Handle navigation_strategy as list or string
- Add .env.example with configuration templates
- Add test script and sample generated scrapers for RWTH and KAUST

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

test_rwth.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+"""Test script to run the agent for RWTH Aachen University."""
+import os
+
+# Configure OpenRouter - set OPENROUTER_API_KEY environment variable
+import winreg
+
+def get_user_env(name):
+    """Get user environment variable on Windows."""
+    try:
+        with winreg.OpenKey(winreg.HKEY_CURRENT_USER, r"Environment") as key:
+            return winreg.QueryValueEx(key, name)[0]
+    except Exception:
+        return os.environ.get(name)
+
+openrouter_key = get_user_env("OPENROUTER_API_KEY")
+if not openrouter_key:
+    raise ValueError("Please set OPENROUTER_API_KEY environment variable")
+
+os.environ["OPENAI_API_KEY"] = openrouter_key
+os.environ["CODEGEN_MODEL_PROVIDER"] = "openrouter"
+os.environ["CODEGEN_OPENROUTER_MODEL"] = "anthropic/claude-3-opus"
+
+print("Using OpenRouter with Claude 3 Opus")
+
+# Run the agent
+from university_agent import GenerationEngine, GenerationRequest, Settings
+
+settings = Settings()
+print(f"Provider: {settings.model_provider}")
+print(f"Model: {settings.openrouter_model}")
+
+engine = GenerationEngine(settings)
+request = GenerationRequest(
+    target_url="https://www.kaust.edu.sa/en/",
+    campus_name="KAUST",
+    assumed_language="English",
+    max_depth=3,
+    max_pages=30,
+)
+
+print("Starting generation for KAUST...")
+result = engine.generate(request, capture_snapshot=True)
+print(f"Script saved to: {result.script_path}")
+print(f"Project slug: {result.plan.project_slug}")