fix(cli): wrap streaming-phase download timeout with friendly message

downloadVerifiedBinary only wrapped isTimeoutError around the fetch()
catch, so a 15-minute timeout firing while pipeline() streamed the
response body re-threw the raw "TimeoutError: The operation timed out."
Mirror the wrap into the pipeline catch after cleaning up the partial
file, matching the connection-phase message.

Fixes #6822

packages/coding-agent/src/cli/update-cli.ts

@@ -231,6 +231,9 @@ export async function downloadVerifiedBinary(options: VerifiedBinaryDownloadOpti
 		await fs.promises.chmod(options.targetPath, 0o755);
 	} catch (err) {
 		await unlinkIfExists(options.targetPath);
+		if (isTimeoutError(err)) {
+			throw new Error("Timed out downloading release binary after 15 minutes", { cause: err });
+		}
 		throw err;
 	}
 }