Clearcut logging - initial implementation (#1274)

Flag-guarded initial implementation of a clearcut logger to collect telemetry data and send it to Concord for dashboards, etc.

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -23,6 +23,7 @@ import {
   EditorType,
   ThoughtSummary,
   isAuthError,
+  UserPromptEvent,
 } from '@gemini-cli/core';
 import { type Part, type PartListUnion } from '@google/genai';
 import {
@@ -213,10 +214,10 @@ export const useGeminiStream = (
 
       if (typeof query === 'string') {
         const trimmedQuery = query.trim();
-        logUserPrompt(config, {
-          prompt: trimmedQuery,
-          prompt_length: trimmedQuery.length,
-        });
+        logUserPrompt(
+          config,
+          new UserPromptEvent(trimmedQuery.length, trimmedQuery),
+        );
         onDebugMessage(`User query: '${trimmedQuery}'`);
         await logger?.logMessage(MessageSenderType.USER, trimmedQuery);