Add event inventory pickups

data/scenarios/001_yellow_turbans.json

@@ -84,7 +84,8 @@
       "once": true,
       "when": { "type": "battle_start" },
       "actions": [
-        { "type": "log", "text": "Cao Cao engages the Yellow Turbans." }
+        { "type": "log", "text": "Cao Cao engages the Yellow Turbans." },
+        { "type": "log", "text": "A small supply cache is hidden in the northern woods." }
       ]
     },
     {
@@ -101,6 +102,15 @@
         }
       ]
     },
+    {
+      "id": "northern_woods_cache",
+      "once": true,
+      "when": { "type": "unit_reaches_tile", "team": "player", "pos": [3, 2] },
+      "actions": [
+        { "type": "log", "text": "The northern woods cache is recovered." },
+        { "type": "grant_item", "item_id": "bean" }
+      ]
+    },
     {
       "id": "turn_2_warning",
       "once": true,