The web E2E seed lane for the pwsh terminal card failed on every platform
with `duplicate loader entry id: tool-pwsh`. The overlay inserted a new
tool-pwsh row, but the base bundle has declared that id since the shell
platform layer moved into it, so the overlay's insert delivered a second
row with the same id and the loader rejected the pair at boot.
Enable the existing tool-pwsh row by id instead of inserting it, and
disable pwsh-sandbox so the inserted pwsh-local is the lone executor on
every platform (the base gates pwsh-sandbox on win32, which would
otherwise collide with the inserted executor there).
9523dff0fd