Fix race condition (#676)

Server start events were sometimes not being tracked because of a race
condition. Adding 150ms wait for now. Longer term solution:
https://app.clickup.com/t/86b7bm6kp

Other events do not suffer from this issue

libs/arcade-mcp-server/arcade_mcp_server/usage/server_tracker.py

@@ -110,6 +110,13 @@ class ServerTracker:
         self.usage_service.capture(
             EVENT_MCP_SERVER_STARTED, self.user_id, properties=properties, is_anon=is_anon
         )
+        # TODO: Use background thread instead of subprocess to capture server start events.
+        # Using a subprocess for server starts is not ideal because the parent immediately enters `uvicorn.run()`
+        # for http and `asyncio.run()` for stdio which is blocking and prevents the subprocess from starting.
+        # Therefore we add a small delay to ensure the subprocess has started.
+
+        # Assumes that the process creation takes  max ~50ms and Python startup takes max ~100ms.
+        time.sleep(0.15)
 
     def track_tool_call(
         self,

libs/arcade-mcp-server/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "arcade-mcp-server"
-version = "1.7.2"
+version = "1.7.3"
 description = "Model Context Protocol (MCP) server framework for Arcade.dev"
 readme = "README.md"
 authors = [{ name = "Arcade.dev" }]