adventure: drain Pete's equip queue and apply it for real

Poll Pete for equip/unequip orders an owner placed on the web, run them through
the real magic-item equip path so bond caps and slot eviction still hold, and
file a verdict. Same reverse pipe as mischief, with one difference that matters:
the equip action is not idempotent, so a re-offered order after a lost ack would
double-move the item. An equip_applied_orders ledger keyed on the order guid is
the guard: applied once, re-offers only re-file the stored verdict.

The delicate remove-before-equip ordering that prevents item duplication is now
one shared applyMagicEquip/applyMagicUnequip core, called by both the DM
resolver and this poller, so the anti-dup ordering can't drift between two
copies. Items now carry their inventory row id to Pete as the equip handle.

internal/plugin/adventure.go

@@ -291,6 +291,7 @@ func (p *AdventurePlugin) Init() error {
 	go p.expeditionBoredomTicker()
 	go p.mischiefTicker()
 	go p.peteMischiefTicker()
+	go p.peteEquipTicker()
 
 	// Auto-cashout any arena runs left in 'awaiting' from a prior restart
 	p.arenaCleanupStaleRuns()