Update Aegis

Update the installed Aegis Method Pack for the current AI coding host.

This skill is host maintenance. Do not edit the target project just because the user asked to update Aegis.

Default Semantics

aegis:update updates the current host's registered Aegis installation.
Updating every registered host requires an explicit --all request.
If more than one host is registered and the current host cannot be identified, ask one concrete question before updating.
Do not update a development checkout when the installed method-pack root is a separate path.
Do not perform background automatic updates. The local registry may record updateMode, but this skill only performs explicit user-triggered updates.