/equipment lists active equipment for any member with status and the
required-certification gate shown up front (Reserve is disabled when the
item is unavailable or the member is not certified). Reserving opens an
inline start/end/notes form; the action enforces eligibility and
no-overlap server-side. Sidebar gets a member-visible "Equipment" link.
/equipment/manage (guarded by equipment.manage) lists equipment with
inline create/edit, status (available/maintenance/retired), an optional
required-certification picker, asset tag, archive/restore and delete
(refused once reservations exist). Sidebar gets a "Manage equipment"
link in the Admin block. Member browse/reserve is the next phase.