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/pete_roster.go

@@ -242,6 +242,14 @@ func itemViews(items []AdvItem) []peteclient.ItemView {
 			v.Desc = eff.Desc
 			v.Effect = magicItemEffectSummary(eff)
 			v.Attunement = eff.Attunement
+			// The row id is the equip handle: a slotted magic item is the one thing
+			// the web equip path can wear, so only it carries an id. Mundane gear (the
+			// branch below) and unslotted curios get none, so no Equip button. This
+			// runs for vault rows too — a vault magic item would carry an id — but Pete
+			// offers the button on the backpack panel alone, so that's inert, not a leak.
+			if eff.Slot != "" {
+				v.ID = it.ID
+			}
 		} else if it.Slot != "" {
 			// Shop equipment resolves by (slot, tier) — Name is decorative.
 			v.Desc = equipmentDefByTier(it.Slot, it.Tier).Description