fix(coding-agent): use shell execution for spawn on Windows

fixes #1220

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed Windows package installs regression by using shell execution instead of `.cmd` resolution ([#1220](https://github.com/badlogic/pi-mono/issues/1220))
+
 ## [0.51.4] - 2026-02-03
 
 ### New Features

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

@@ -1595,19 +1595,12 @@ export class DefaultPackageManager implements PackageManager {
 		};
 	}
 
-	private resolveCommand(command: string): string {
-		if (process.platform === "win32" && command === "npm") {
-			return "npm.cmd";
-		}
-		return command;
-	}
-
 	private runCommand(command: string, args: string[], options?: { cwd?: string }): Promise<void> {
-		const resolvedCommand = this.resolveCommand(command);
 		return new Promise((resolvePromise, reject) => {
-			const child = spawn(resolvedCommand, args, {
+			const child = spawn(command, args, {
 				cwd: options?.cwd,
 				stdio: "inherit",
+				shell: process.platform === "win32",
 			});
 			child.on("error", reject);
 			child.on("exit", (code) => {
@@ -1621,8 +1614,11 @@ export class DefaultPackageManager implements PackageManager {
 	}
 
 	private runCommandSync(command: string, args: string[]): string {
-		const resolvedCommand = this.resolveCommand(command);
-		const result = spawnSync(resolvedCommand, args, { stdio: ["ignore", "pipe", "pipe"], encoding: "utf-8" });
+		const result = spawnSync(command, args, {
+			stdio: ["ignore", "pipe", "pipe"],
+			encoding: "utf-8",
+			shell: process.platform === "win32",
+		});
 		if (result.status !== 0) {
 			throw new Error(`Failed to run ${command} ${args.join(" ")}: ${result.stderr || result.stdout}`);
 		}