fix(package-manager): ignore managed npm folders in cloud sync

closes #4763

packages/coding-agent/src/core/package-manager.ts

@@ -30,7 +30,7 @@ import { minimatch } from "minimatch";
 import { CONFIG_DIR_NAME } from "../config.ts";
 import { spawnProcess, spawnProcessSync } from "../utils/child-process.ts";
 import { type GitSource, parseGitUrl } from "../utils/git.ts";
-import { canonicalizePath, isLocalPath } from "../utils/paths.ts";
+import { canonicalizePath, isLocalPath, markPathIgnoredByCloudSync } from "../utils/paths.ts";
 import { isStdoutTakenOver } from "./output-guard.ts";
 import type { PackageSource, SettingsManager } from "./settings-manager.ts";
 
@@ -1822,6 +1822,7 @@ export class DefaultPackageManager implements PackageManager {
 		if (!existsSync(installRoot)) {
 			mkdirSync(installRoot, { recursive: true });
 		}
+		markPathIgnoredByCloudSync(installRoot);
 		this.ensureGitIgnore(installRoot);
 		const packageJsonPath = join(installRoot, "package.json");
 		if (!existsSync(packageJsonPath)) {