fix: runtime fixes for WSL deployment and integration testing

- Fix RunnableConfig type annotations (dict -> RunnableConfig) for LangGraph compat
- Fix AzDo PR URL parsing (_links.web.href fallback + remoteUrl construction)
- Fix AzDo diff endpoint (use iterations/changes instead of non-existent diffs API)
- Fix _format_diff to read changeEntries field (not changes)
- Fix URL encoding for project names with spaces (Billo App Platform)
- Fix subprocess.run for Windows (replace asyncio.create_subprocess_exec with thread pool)
- Fix SlackClient to handle empty webhook URL gracefully
- Fix notify_request_changes to catch all exceptions (not just ReleaseAgentError)
- Fix JSON parsing to strip whitespace before json.loads
- Add CLAUDE_CMD config field for cross-platform CLI path
- Add run.py for Windows SelectorEventLoop workaround
- Add db port mapping in docker-compose for local dev
- Add comprehensive README sections: WSL setup, known issues, TODO list

run.py

@@ -0,0 +1,22 @@
+"""Windows-compatible startup script.
+
+psycopg async requires SelectorEventLoop, not the default ProactorEventLoop on Windows.
+This script sets the correct event loop policy before starting uvicorn.
+"""
+
+import asyncio
+import sys
+
+if sys.platform == "win32":
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
+import uvicorn
+
+if __name__ == "__main__":
+    uvicorn.run(
+        "release_agent.main:app",
+        host="0.0.0.0",
+        port=8080,
+        reload=False,
+        loop="none",  # don't let uvicorn override the event loop
+    )