Read named grant keys and signed values from new COBJECTS JSON

Grant pair lists now carry name strings ("HLR-021", "Unarmed Combat")
instead of integer hashes, so they are stored as name -> value maps.
Unresolved hashes are kept as their decimal string and logged.

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

src/engine/parsers/objects/PowerGrant.java

@@ -10,24 +10,18 @@ package engine.parsers.objects;
 
 import org.json.JSONArray;
 
-import java.util.ArrayList;
+import java.util.LinkedHashMap;
 
 // One entry of item_power_grant.
-//
-// power_granted_skills and power_granted_powers entries look like
-// [hash, value] pairs (first element is a 32-bit string hash, some
-// exceed Integer.MAX_VALUE in the JSON and are stored wrapped to int).
-// This reading is from the data only and has not been confirmed in the client.
-//
-// power_granted_attrs and power_monster_types are empty in every DEED and
-// RUNE file, so their shape is unknown and they are kept as raw JSON.
+// The granted lists are [key, value] pairs, unsigned key and signed value (sb.exe 0x6D7640).
+// power_monster_types is empty in every DEED and RUNE file, so it is kept as raw JSON.
 
 public class PowerGrant {
 
     public String power_type;
     public int power_value;
-    public JSONArray power_granted_attrs;
-    public final ArrayList<int[]> power_granted_skills = new ArrayList<>();
-    public final ArrayList<int[]> power_granted_powers = new ArrayList<>();
+    public final LinkedHashMap<String, Integer> power_granted_attrs = new LinkedHashMap<>();
+    public final LinkedHashMap<String, Integer> power_granted_skills = new LinkedHashMap<>();
+    public final LinkedHashMap<String, Integer> power_granted_powers = new LinkedHashMap<>();
     public JSONArray power_monster_types;
 }