- Skip binary existence check in probe(): Redox scheme paths
(especially /scheme/initfs/) may block on open/stat indefinitely.
Command::new() spawn fails cleanly if binary missing.
- In initfs mode: use synchronous probe, do bounded deferred
retries, then exit. Rootfs instance handles hotplug.
- Avoids pcid config handle read hang that blocks async threads.
vasilito
cd05afdcb1