init: add source code from src.zip

src/utils/immediateCommand.ts

@@ -0,0 +1,15 @@
+import { getFeatureValue_CACHED_MAY_BE_STALE } from '../services/analytics/growthbook.js'
+
+/**
+ * Whether inference-config commands (/model, /fast, /effort) should execute
+ * immediately (during a running query) rather than waiting for the current
+ * turn to finish.
+ *
+ * Always enabled for ants; gated by experiment for external users.
+ */
+export function shouldInferenceConfigCommandBeImmediate(): boolean {
+  return (
+    process.env.USER_TYPE === 'ant' ||
+    getFeatureValue_CACHED_MAY_BE_STALE('tengu_immediate_model_command', false)
+  )
+}