The room-exit portal was invisible in the first playtest - players loitered
out the 30s ExploreGrace timeout. Adds RegionMath.ExpeditionPortalPos as the
single client-derivable portal-position authority (HUD prompt + beacon can't
drift), a pooled breathing HDR pillar in CombatFeedbackSystem shown only
during RoomExplore, and an in-range/out-of-range two-stage prompt.
Also repairs the comment-swallowed _portalMat initialization (NRE in
OnStartRunning killed ALL combat feedback each session and auto-paused the
editor via Error Pause). 456/456 EditMode.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
kronic
274cf3b791