Work orders: fill a reagent slot after posting; no auto-reload while writing an order

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

game.py

@@ -2125,6 +2125,22 @@ def post_order(world: dict, player: dict, kind: str, item: str, qty, provide, re
     return None
 
 
+def provide_reagent(world: dict, player: dict, order_id, item: str) -> str | None:
+    """Put a reagent into your own order after posting it, enough for what's still to be made."""
+    order = order_by_id(world, order_id)
+    if not order or order["by"] != player["id"] or order["status"] != "open" or order["kind"] != "craft":
+        return "No such order"
+    action = ACTION_BY_ID[order["action"]]
+    if item not in action["inputs"] or item in order["provided"]:
+        return "Already provided" if item in order["provided"] else "That isn't in the recipe"
+    need = action["inputs"][item] * _batches(action, order["item"], order["qty"] - order["delivered"])
+    if player["bank"].get(item, 0) < need:
+        return f"{ITEMS[item]['name']}: {player['bank'].get(item, 0)} / {need}"
+    bank_take(player, item, need)
+    order["provided"][item] = need
+    return None
+
+
 def _refund(world: dict, order: dict, now: float) -> None:
     owner = world["players"].get(order["by"])
     if not owner: