🔒 Prevent CWD binary-hijacking in shell-spawning

[beingniloy]

🎯 What

The shell selection (restart-shell) IPC channel was hardened to prevent potential CWD binary-hijacking and path-traversal bypasses.

⚠️ Risk

When spawning a shell process with a relative/simple binary name (e.g. powershell.exe or cmd.exe) in a multi-tenant or untrusted workspace, Windows/POSIX OSes may resolve the binary relative to the current working directory (workspaceRoot). A malicious user could place a rogue executable named powershell.exe in the project root to achieve arbitrary code execution.

🛡️ Solution

All allowed shells are now mapped to secure, absolute system paths on the secure Electron main-process side (using environment properties like %SystemRoot% on Windows, or standard locations like /bin / /usr/bin on POSIX) before spawning the process.

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PR created automatically by Jules for task 14361585504435194355 started by @beingniloy

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