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emozilla
928280ca2c
A user-reported failure on Windows-on-ARM: a pre-installed Python 3.13 on PATH makes findSystemPython() succeed, so resolveHermesBackend returns a backend pointing at it -- but hermes_cli isn't in that interpreter's site-packages. The spawn dies with ModuleNotFoundError and the user sees a dead GUI instead of the first-launch installer. Same shape can hit step 4 (existing `hermes` on PATH) when a stale shim survives a partial uninstall. Add cheap exit-code probes -- `python -c "import hermes_cli"` for step 5, `<hermes> --version` for step 4 -- and fall through to step 6 (bootstrap-needed) on failure. install.ps1 then runs as if on a clean box and the venv gets built. Probes live in a standalone electron/backend-probes.cjs module so they can be unit-tested with node --test, same pattern as bootstrap-platform.cjs and hardening.cjs. New test file wired into test:desktop:platforms.