Add: just commands for release build

docs/TAURI_RUNTIME_TESTING.md

@@ -68,6 +68,10 @@ An issue touching Tauri runtime behaviors must satisfy all requirements before `
 7. Verify sprite-pack loading:
 - valid selected pack loads correctly
 - invalid pack path failure is surfaced and runtime remains alive
+8. Verify frameless window drag behavior:
+- left-mouse drag moves the window
+- window remains non-resizable
+- moved position is reflected in runtime snapshot state (`x`, `y`) and persists after restart
 
 ## API + Runtime Contract Checklist