feat(currency): money moves through the bounded vocabulary (§6)

give_item(gold) is +10,000c and does NOT mark gifts_given — that gate is a
global one-shot keyed by item id, so marking money would let an NPC pay you
exactly once per campaign. accept_item(<denom>) is offered only for the
denominations the purse can actually pay.

The eight moves do not grow. MoveValidator is untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QYa9u7Kdxv5gX4AnwWexy8

client/scripts/npc/move_applier.gd

@@ -23,10 +23,11 @@ static func apply(moves: Array, game_state, canon_log, content_db, npc_id: Strin
 				game_state.mark_revealed(str(args[0]))
 			"give_item":
 				var i: String = str(args[0])
-				game_state.add_item(i, 1)
-				game_state.mark_gift_given(i)
+				game_state.grant(i, 1)
+				if not Currency.is_currency(i):
+					game_state.mark_gift_given(i)  # the one-shot gate is for real items only
 			"accept_item":
-				game_state.remove_item(str(args[0]), 1)
+				game_state.take(str(args[0]), 1)
 			"adjust_disposition":
 				var delta: int = clampi(int(str(args[0])), -MAX_DELTA, MAX_DELTA)
 				var cur: int = int(game_state.npc_dispositions.get(npc_id, 0))