Add cache parsers and POJOs for DEED and RUNE templates

New engine.parsers package:
- cache: DeedParser and RuneParser load COBJECTS/DEED and COBJECTS/RUNE
  JSON straight from the data dir, keyed by file id. CacheParserUtil
  holds the shared JSON helpers.
- objects: standalone DeedTemplate and RuneTemplate covering every
  field in the client data, plus shared PowerGrant/UserPowerAction.
- wpak: placeholder for upcoming wpak parsers.

Not wired into server startup yet.

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

src/engine/parsers/objects/PowerGrant.java

@@ -0,0 +1,33 @@
+//  • ▌ ▄ ·.  ▄▄▄·  ▄▄ • ▪   ▄▄· ▄▄▄▄·  ▄▄▄·  ▐▄▄▄  ▄▄▄ .
+//  ·██ ▐███▪▐█ ▀█ ▐█ ▀ ▪██ ▐█ ▌▪▐█ ▀█▪▐█ ▀█ •█▌ ▐█▐▌·
+//  ▐█ ▌▐▌▐█·▄█▀▀█ ▄█ ▀█▄▐█·██ ▄▄▐█▀▀█▄▄█▀▀█ ▐█▐ ▐▌▐▀▀▀
+//  ██ ██▌▐█▌▐█ ▪▐▌▐█▄▪▐█▐█▌▐███▌██▄▪▐█▐█ ▪▐▌██▐ █▌▐█▄▄▌
+//  ▀▀  █▪▀▀▀ ▀  ▀ ·▀▀▀▀ ▀▀▀·▀▀▀ ·▀▀▀▀  ▀  ▀ ▀▀  █▪ ▀▀▀
+//      Magicbane Emulator Project © 2013 - 2026
+//                https://www.magicbane.com
+
+package engine.parsers.objects;
+
+import org.json.JSONArray;
+
+import java.util.ArrayList;
+
+// 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.
+
+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 JSONArray power_monster_types;
+}