fix: Replace mock node symlink with wrapper script

[charlesvien]

Problem

The mock node environment used a symlink from node → Electron binary, but ELECTRON_RUN_AS_NODE wasn't set for grandchild processes (e.g. node -v from the SDK).

This caused full Electron instances to spawn instead of running as Node.js, triggering thousands of second-instance events and zombie processes.

Changes

1. Replace symlink with a shell wrapper script that exports ELECTRON_RUN_AS_NODE=1
2. Clean up existing symlink before writing the wrapper
3. Make wrapper executable with chmod 755

How did you test this?

Manually

[charlesvien]

• fix: Replace mock node symlink with wrapper script #1404 👈 (View in Graphite)
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