wiki: valet / over-capacity mode; 'full' is a soft operator policy

Capture that refusing at capacity is the default, not absolute: an operator
may opt into valet over-capacity (customer hands over keys, operator stacks
the car into custody). Manned-only, new custody/session shape. Deferred;
not built into the entry flow. Made capacity-occupancy's FULL gate a soft
policy knob.

wiki/concepts/capacity-occupancy.md

@@ -33,8 +33,16 @@ editable and drifts; the chain is the truth). Spaces-free = `capacity − occupa
   loop count, or the [[opencv-anpr-service|vision]] count) reconciles it — surfaced as an anomaly,
   not silently corrected.
 
+## "Full" is a soft, operator-configurable policy
+
+Refusing at capacity is the **default**, not an absolute. An operator may opt into
+**[[valet-overcapacity|valet over-capacity]]** — accept the car into operator custody (keys handed
+over, stacked beyond the marked count) instead of refusing. So the FULL gate is a policy knob
+(refuse vs. valet-accept), set by the operator per site. Valet is a manned-mode feature with its
+own custody/session shape — see [[valet-overcapacity]] (deferred).
+
 ## Open
 
-- Whether "FULL" is a hard block or a soft warning (operator can wave one in) — operator policy.
 - Zone/level granularity at launch vs. single capacity number.
 - Reserve-for-permits threshold.
+- The valet over-capacity mode + custody model ([[valet-overcapacity]]).