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/RuneTemplate.java

@@ -189,18 +189,16 @@ public class RuneTemplate {
     public int rune_natural_power_attack;
     public final HashMap<String, String> rune_sparse_data = new HashMap<>();
 
-    // One entry of rune_skill_grant.
-    // skill_granted_skills entries look like [hash, value] pairs; not confirmed in the client.
-    // skill_granted_attrs, skill_granted_powers and skill_monster_types are empty
-    // in every RUNE file, so they are kept as raw JSON.
+    // One entry of rune_skill_grant; same layout as PowerGrant.
+    // skill_monster_types is empty in every RUNE file, so it is kept as raw JSON.
 
     public static class SkillGrant {
 
         public String skill_type;
         public int skill_value;
-        public JSONArray skill_granted_attrs;
-        public final ArrayList<int[]> skill_granted_skills = new ArrayList<>();
-        public JSONArray skill_granted_powers;
+        public final LinkedHashMap<String, Integer> skill_granted_attrs = new LinkedHashMap<>();
+        public final LinkedHashMap<String, Integer> skill_granted_skills = new LinkedHashMap<>();
+        public final LinkedHashMap<String, Integer> skill_granted_powers = new LinkedHashMap<>();
         public JSONArray skill_monster_types;
     }