fix: replace asyncio subprocess proxy with thread-based Popen proxy

asyncio subprocess PIPE unreliable for long-lived stdio bridging. Use Popen + threads instead. Also fix smoke_test.sh stdin handling.

ilsp/server.py

@@ -11,6 +11,7 @@ import asyncio
 import logging
 import os
 import signal
+import threading
 
 from aiohttp import web
 
@@ -58,13 +59,23 @@ async def main_async() -> None:
         level=logging.INFO,
         format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
     )
+    logging.getLogger("ilsp.bicep_lsp.proxy").setLevel(logging.DEBUG)
 
     # Pre-warm caches
     logger.info("Pre-warming catalogs…")
+    from .bicep_lsp.modules import BicepModuleCatalog
     await asyncio.gather(
         PypiCatalog.start_background_refresh(),
+        BicepModuleCatalog.start_background_refresh(),
     )
 
+    # Start Bicep LSP proxy in a daemon thread (blocking socket server)
+    threading.Thread(
+        target=serve_bicep,
+        args=(BICEP_LSP_PORT,),
+        daemon=True,
+    ).start()
+
     # Build health app
     health_app = await _health_app()
     runner = web.AppRunner(health_app)
@@ -73,11 +84,8 @@ async def main_async() -> None:
     await site.start()
     logger.info("Health endpoint on http://0.0.0.0:%d/health", HEALTH_PORT)
 
-    # Run all services
-    await asyncio.gather(
-        _serve_python_lsp(PYTHON_LSP_PORT),
-        serve_bicep(BICEP_LSP_PORT),
-    )
+    # Run remaining asyncio services
+    await _serve_python_lsp(PYTHON_LSP_PORT)
 
 
 def main() -> None: