agent v0.26.0: slice 10 P2 activation — POST /guest/reboot (user-triggered)

Self-scoped guest reboot (pct reboot, detached, 202) so an enrolled-into-running-
guest drive's persisted bind activates at next boot. Tests: accepted + cross-guest
403. Pairs with controller v0.49.0 pending-drive detection + "Újraindítás most".

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

internal/localapi/server.go

@@ -207,6 +207,8 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("POST /disks/format", s.withGuest(s.handleDiskFormat))
 	// Guest data-drive passthrough (slice 10 P2): bind an enrolled drive's felhom-data namespace in.
 	mux.HandleFunc("POST /disks/guest-attach", s.withGuest(s.handleDiskGuestAttach))
+	// Guest reboot (slice 10 P2 activation): user-triggered restart to activate pending drive binds.
+	mux.HandleFunc("POST /guest/reboot", s.withGuest(s.handleGuestReboot))
 	return mux
 }