fix windows eventloop

backend/pyproject.toml

@@ -12,7 +12,8 @@ dependencies = [
     "posthog",
     "pydantic==2.10.5",
     "watchfiles",
-    "swarm-debug"
+    "swarm-debug",
+    "winloop; sys_platform == 'win32'",
 ]
 
 [dependency-groups]

backend/run.sh

@@ -37,7 +37,15 @@ BACKEND_PORT=$("$PY" -c "import json,sys; print(json.load(open(sys.argv[1], enco
 # --- Start the backend server ---
 echo "Starting backend server on http://0.0.0.0:${BACKEND_PORT} ..."
 cd "$PROJECT_ROOT_ABSPATH"
+
+# Windows needs winloop for subprocess support with --reload
+if [[ "$IS_WINDOWS" == "true" ]]; then
+    LOOP_ARG="--loop winloop:new_event_loop"
+else
+    LOOP_ARG=""
+fi
+
 WATCHFILES_FORCE_POLLING=true "$UV_BIN" run --project "$BACKEND_DIR_ABSPATH" python -m uvicorn backend.main:app \
     --host 0.0.0.0 --port "$BACKEND_PORT" --reload \
     --reload-dir "$BACKEND_DIR_ABSPATH" \
-    --reload-exclude '*.pyc'
+    --reload-exclude '*.pyc' $LOOP_ARG

backend/uv.lock

@@ -887,6 +887,7 @@ dependencies = [
     { name = "pydantic" },
     { name = "swarm-debug" },
     { name = "watchfiles" },
+    { name = "winloop", marker = "sys_platform == 'win32'" },
 ]
 
 [package.dev-dependencies]
@@ -910,6 +911,7 @@ requires-dist = [
     { name = "pydantic", specifier = "==2.10.5" },
     { name = "swarm-debug" },
     { name = "watchfiles" },
+    { name = "winloop", marker = "sys_platform == 'win32'" },
 ]
 
 [package.metadata.requires-dev]
@@ -2086,3 +2088,23 @@ wheels = [
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 ]
+
+[[package]]
+name = "winloop"
+version = "0.6.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/70/63/e99dd93ab2a7084606cd4deb403c4b87351579e55c28fab3f4861e3de3f7/winloop-0.6.2.tar.gz", hash = "sha256:8768fb27c692eb92b2c6921d630bbf1f835738003cd429c0db459fea2d48ce10", size = 2560282, upload-time = "2026-04-10T20:42:48.75Z" }
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