Detailed Description
Replaces the direct push of SentientDetailActivity from the Lanyard with a curated landing page that brings together every sentient-management action: switch identity, create / import, change display name, promote shadow → full, manage identicon, OPAL permissions, and the hive-mount surface that lives on top of the sentient.
Mirrors the HiveLobbyActivity shape — a MenuActivity subclass with addGroup / addButton calls only, no bespoke widgets.
Per activity-header-makeover §LM-4. The §LM-4.3 inventory mapped every existing per-action sentient activity to a Primary entry or an existing caller chain; the Vestigial group remains in the structure for any activity that turns up orphaned post-makeover.
