fix(coding-agent): avoid Windows pi update exit assertion

closes #5805

packages/coding-agent/CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Fixed
 
+- Fixed successful `pi update` on Windows to exit naturally instead of calling `process.exit(0)`, avoiding a Node.js/libuv assertion after version-check network requests ([#5805](https://github.com/earendil-works/pi/issues/5805)).
 - Fixed inherited Google and `google-vertex` Gemini model metadata to map `latest` aliases to the current models, add Gemini 3.5 Flash for Vertex, correct Gemini 2.5 Flash Vertex cache pricing, and remove shut-down Vertex preview models ([#5761](https://github.com/earendil-works/pi/issues/5761)).
 - Fixed the session selector to stay open and show the all-sessions empty state when both current-folder and all-scope session lists are empty ([#5747](https://github.com/earendil-works/pi/issues/5747)).
 - Fixed inherited Moonshot AI China model metadata to include Kimi K2.7 Code, and omitted unsupported thinking-off payloads for Kimi K2.7 Code models ([#5760](https://github.com/earendil-works/pi/issues/5760)).

packages/coding-agent/src/main.ts

@@ -467,7 +467,15 @@ export async function main(args: string[], options?: MainOptions) {
 	}
 
 	if (await handlePackageCommand(args, { extensionFactories: options?.extensionFactories })) {
-		process.exit(process.exitCode ?? 0);
+		const exitCode = process.exitCode ?? 0;
+		if (process.platform === "win32" && exitCode === 0 && args[0] === "update") {
+			// We normally prefer process.exit(0) for package commands so bad extensions cannot keep
+			// one-shot commands alive. On Windows, Node can assert after fetch() if process.exit(0)
+			// runs during teardown; let successful `pi update` drain naturally instead.
+			// https://github.com/nodejs/node/issues/56645
+			return;
+		}
+		process.exit(exitCode);
 		return;
 	}