fix(acp): run exit cleanup when stdin closes (#14953)

Signed-off-by: Adrian Cole <adrian@tetrate.io>
Co-authored-by: Allen Hutchison <adh@google.com>
Co-authored-by: Allen Hutchison <allen@hutchison.org>

packages/cli/package.json

@@ -29,7 +29,7 @@
     "sandboxImageUri": "us-docker.pkg.dev/gemini-code-dev/gemini-cli/sandbox:0.26.0-nightly.20260114.bb6c57414"
   },
   "dependencies": {
-    "@agentclientprotocol/sdk": "^0.11.0",
+    "@agentclientprotocol/sdk": "^0.12.0",
     "@google/gemini-cli-core": "file:../core",
     "@google/genai": "1.30.0",
     "@iarna/toml": "^2.2.5",

packages/cli/src/zed-integration/zedIntegration.ts

@@ -44,6 +44,7 @@ import { z } from 'zod';
 import { randomUUID } from 'node:crypto';
 import type { CliArgs } from '../config/config.js';
 import { loadCliConfig } from '../config/config.js';
+import { runExitCleanup } from '../utils/cleanup.js';
 
 export async function runZedIntegration(
   config: Config,
@@ -55,10 +56,15 @@ export async function runZedIntegration(
   const stdin = Readable.toWeb(process.stdin) as ReadableStream<Uint8Array>;
 
   const stream = acp.ndJsonStream(stdout, stdin);
-  new acp.AgentSideConnection(
+  const connection = new acp.AgentSideConnection(
     (connection) => new GeminiAgent(config, settings, argv, connection),
     stream,
   );
+
+  // SIGTERM/SIGINT handlers (in sdk.ts) don't fire when stdin closes.
+  // We must explicitly await the connection close to flush telemetry.
+  // Use finally() to ensure cleanup runs even on stream errors.
+  await connection.closed.finally(runExitCleanup);
 }
 
 export class GeminiAgent {

packages/core/src/core/contentGenerator.ts

@@ -114,10 +114,10 @@ export async function createContentGenerator(
 ): Promise<ContentGenerator> {
   const generator = await (async () => {
     if (gcConfig.fakeResponses) {
-      return new LoggingContentGenerator(
-        await FakeContentGenerator.fromFile(gcConfig.fakeResponses),
-        gcConfig,
+      const fakeGenerator = await FakeContentGenerator.fromFile(
+        gcConfig.fakeResponses,
       );
+      return new LoggingContentGenerator(fakeGenerator, gcConfig);
     }
     const version = await getVersion();
     const model = resolveModel(