fix(startup): signal ready before loading script to prevent UI freeze

Reorder startup sequence to signal ready and start UI loop before
loading the script file. Previously, slow script operations (like
synchronous IPC calls) would block the main thread, causing the
window manager to report "not responding".

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

Author: singaraiona

src/rayforce_thread.c

@@ -589,7 +589,24 @@ void* rfui_rayforce_thread(void* arg) {
     // Step 4: Register rayforce-ui functions (widget, draw)
     register_rfui_functions();
 
-    // Step 5: Load script file if provided via command line
+    // Step 5: Create poll waker for UI messages
+    waker = poll_waker_create(runtime->poll, on_ui_message, ctx);
+    if (!waker) {
+        g_ctx = NULL;
+        runtime_destroy();
+        rfui_ctx_set_quit(ctx, B8_TRUE);
+        rfui_ctx_signal_ready(ctx);
+        return NULL;
+    }
+
+    // Step 6: Store waker in context and signal ready
+    // Signal ready BEFORE loading script so UI loop can start
+    // while potentially slow script operations (IPC, file I/O) execute
+    rfui_ctx_set_waker(ctx, waker);
+    rfui_ctx_signal_ready(ctx);
+
+    // Step 7: Load script file if provided via command line
+    // This may take time (e.g., synchronous IPC calls) but UI is now responsive
     {
         obj_p file_arg = runtime_get_arg("file");
         if (!is_null(file_arg)) {
@@ -607,23 +624,7 @@ void* rfui_rayforce_thread(void* arg) {
         }
     }
 
-    // Step 6: Create poll waker for UI messages
-    waker = poll_waker_create(runtime->poll, on_ui_message, ctx);
-    if (!waker) {
-        g_ctx = NULL;
-        runtime_destroy();
-        rfui_ctx_set_quit(ctx, B8_TRUE);
-        rfui_ctx_signal_ready(ctx);
-        return NULL;
-    }
-
-    // Step 7: Store waker in context
-    rfui_ctx_set_waker(ctx, waker);
-
-    // Step 8: Signal ready
-    rfui_ctx_signal_ready(ctx);
-
-    // Step 9: Run poll loop (blocks until exit)
+    // Step 8: Run poll loop (blocks until exit)
     runtime_run();
 
     // Cleanup