ERR_MODULE_NOT_FOUND: vscode-jsonrpc/node on Node.js v25.6.1 (squad init) #319

Description

Running squad init on Node.js v25.6.1 (via nvm4w) crashes with:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '...squad-cli\node_modules\vscode-jsonrpc\node'
imported from '...squad-cli\node_modules\@github\copilot-sdk\dist\session.js'
Did you mean to import "vscode-jsonrpc/node.js"?

Environment

• OS: Windows 11
• Node.js: v25.6.1 (nvm4w)
• npm: 11.9.0
• squad-cli: 0.8.18 (globally installed)

Root Cause

Node 25 enforces strict ESM resolution requiring .js extensions on imports. @github/copilot-sdk imports vscode-jsonrpc/node without the .js suffix.

Notes

• v0.8.23 release notes mention a fix for this on Node 24+ (lazy copilot-sdk imports + postinstall patch script). The installed version (0.8.18) predates that fix.
• It would be good to confirm the fix in v0.8.25 also covers Node 25.x — the release notes only reference Node 24+.
• Workaround: downgrade to Node 22 LTS.

Steps to Reproduce

1. nvm install 25 / nvm use 25
2. npm install -g @bradygaster/squad-cli@0.8.18
3. squad init

Expected

squad init should work or print a clear minimum-Node-version error.