OS updates, guest fast lane (11 §8 step 2): felhom-os-apply wrapper (R1-R13 refusals, repair first, snapshot.debian.org fallback), FELHOM_OSAPPLY sudoers, the OS leg after the primary backup, hub os_update block + os-report, --selftest=os-update

No automatic undo: a customer guest cannot be snapshotted (R-837, measured).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

internal/capability/manifest.go

@@ -123,6 +123,9 @@ var manifest = []Capability{
 	{"dnsmasq-install", "dnsmasq package install", "/usr/bin/apt-get", []string{"install", "-y", "-q", "dnsmasq"}, false, ""},
 	{"dnsmasq-write", "dnsmasq drop-in write", "/usr/bin/install", []string{"-m", "0644", "/tmp/felhom-resolver-x.conf", "/etc/dnsmasq.d/felhom-x.conf"}, false, ""},
 	{"dnsmasq-enable", "dnsmasq enable", "/usr/bin/systemctl", []string{"enable", "--now", "dnsmasq"}, false, ""},
+
+	// ---- OS updates, guest fast lane (`11` §5.4.1; the wrapper holds every rule) ----
+	{"osapply-run", "OS update wrapper (guest fast lane)", "/usr/local/sbin/felhom-os-apply", []string{"--plan", "/var/lib/felhom-agent/os/plan-x.json"}, false, ""},
 	{"dnsmasq-reload", "dnsmasq reload", "/usr/bin/systemctl", []string{"reload", "dnsmasq"}, false, ""},
 	{"dnsmasq-restart", "dnsmasq restart (LAN-DNS self-heal)", "/usr/bin/systemctl", []string{"restart", "dnsmasq"}, false, ""},
 	{"dnsmasq-rm", "dnsmasq drop-in remove (decommission)", "/usr/bin/rm", []string{"-f", "/etc/dnsmasq.d/felhom-x.conf"}, false, ""},