fix(coding-agent): guard undici install under Bun

[dmasiero]

Summary

Fix the v0.75.1 Bun-compiled release binary startup crash caused by statically importing install from undici.

Bun's built-in undici module exposes EnvHttpProxyAgent and setGlobalDispatcher, but not install, so the binary fails during module loading with:

SyntaxError: Export named 'install' not found in module 'undici'.

This changes the import to a namespace import and calls install() only when that export exists. That should preserve the Node 26 fix for #4650, #4652, and #4653, because npm undici still exports install() under Node, while avoiding the Bun startup crash where the export is absent.

Fixes #4657.

Testing

• npm run check
• Built the patched binary in a separate local worktree and verified pi --version / pi --help work after installing through my NixOS flake

[github-actions]

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[badlogic]

cheers

[badlogic]

cheers