Document terminal workflows and provide a backed-up guest runtime update

docs/install.md

@@ -1,6 +1,6 @@
-# Install HydraOS
+# Install Hydra OS
 
-HydraOS targets x86_64 UEFI systems. Disable Secure Boot for this first image.
+Hydra OS targets x86_64 UEFI systems. Disable Secure Boot for this first image.
 Boot the ISO and open the recovery terminal. The live session uses a locked
 `hydra-live` account with local sudo access; changes in the live filesystem are
 volatile. The image provides no default SSH login or universal installed password.
@@ -70,7 +70,7 @@ shuts down, and launches a second QEMU with the ISO absent. It verifies password
 login, disk root, removed live overrides, services, bridge/NAT configuration,
 DNS, recovery tools, and a routed new TCP connection from a synthetic LAN to a
 synthetic VM endpoint. Network namespaces and veth interfaces exist only inside
-the disposable HydraOS guest. When guest KVM is available, it launches a further
+the disposable Hydra OS guest. When guest KVM is available, it launches a further
 fresh-disk QEMU as the installed account to exercise KVM, the bridge helper,
 and private QMP; this checks VM launch, not a nested operating system boot.
 It also logs the installed account out and back in, checking that the same VM,
@@ -88,7 +88,7 @@ acceptance.
 ## Checks requiring the laptop
 
 Disposable QEMU results cannot establish ASUS FX517ZC hardware support. Before
-using HydraOS daily, boot the live ISO and observe Wi-Fi, touchpad, audio,
+using Hydra OS daily, boot the live ISO and observe Wi-Fi, touchpad, audio,
 brightness, suspend/resume, USB device selection, input capture, and actual
 display refresh. Physical installation and these checks remain pending until
 explicitly performed and recorded.