refactor(logging): Centralize all console messaging to a shared logger (part 1) (#11537)

packages/cli/src/services/prompt-processors/atFileProcessor.ts

@@ -5,6 +5,7 @@
  */
 
 import {
+  debugLogger,
   flatMapTextParts,
   readPathFromWorkspace,
 } from '@google/gemini-cli-core';
@@ -68,8 +69,9 @@ export class AtFileProcessor implements IPromptProcessor {
             error instanceof Error ? error.message : String(error);
           const uiMessage = `Failed to inject content for '@{${pathStr}}': ${message}`;
 
-          console.error(
-            `[AtFileProcessor] ${uiMessage}. Leaving placeholder in prompt.`,
+          // `context.invocation` should always be present at this point.
+          debugLogger.error(
+            `Error while loading custom command (${context.invocation!.name}) ${uiMessage}. Leaving placeholder in prompt.`,
           );
           context.ui.addItem(
             { type: MessageType.ERROR, text: uiMessage },