agent v0.36.3: DetachDrive loop-umounts stacked binds (full detach)

Detach now removes ALL stacked binds at a stable path, not just one layer, so an
eject fully detaches even with >1 bind (keeping fail-close intact).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cmd/felhom-agent/main.go

@@ -44,7 +44,7 @@ import (
 
 // version is the agent version. Overridable at build time with
 // -ldflags "-X main.version=<v>"; defaults to the in-repo CHANGELOG version.
-var version = "0.36.2"
+var version = "0.36.3"
 
 // runGuestHook is the PVE pre-start hook body (`felhom-agent guest-hook <vmid> <phase>`). On the
 // pre-start phase it creates placeholder dirs for any absent bind-mount source so the guest always boots