Load rune skill reqs from rune_skill_grant instead of static_skill_skillreq

SkillReq.getSkillReqsForRune builds each rune's list from the RUNE JSON
on first use and caches it: skill_value is the grant level and
skill_granted_skills are the prereqs. The prereq amounts (80, Warrior 50,
Sun Dancer 60) are loaded but not yet read; CharacterSkill keeps its
hard-coded 80 and validForWarrior.
Parity (scripts/p29.py): 47 of 79 DB runes match. Value changes (JSON
wins, Task 2.9 decisions):
- Thief Dagger Mastery, Throwing, Unarmed Combat Mastery: level 15 -> 20
- Sentinel Axe/Great Axe/Hammer/Great Hammer/Sword Mastery: 20 -> 15;
  gains Great Sword Mastery (15, Sword); loses Wear Armor, Medium
- Channeler loses Sword; Storm Lord loses Stormcalling
- Blood Horn gains Hammer Mastery (20, Hammer)
- No weapon prereq any more on Archer Archery, Blade Weaver Blade Weaving,
  Sun Dancer Sun Dancing and the 11 Master of X talents
- No effect: Druid/Prelate Sword and Fury Spear 10 -> 1 (promotion is at
  10), discipline/talent level changes (they need level 20), Throwing
  prereqs (always granted), Blade Master Sword prereq (granted at 1)
- JSON-only runes (Archon, Duelist, War Correspondent, Pet, mob/guard
  races) gain lists; Archon resistances and Duelist Dueling are not
  skills and are skipped with a warning

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

src/engine/objects/SkillReq.java

@@ -10,18 +10,27 @@
 package engine.objects;
 
 import engine.gameManager.DbManager;
+import engine.parsers.objects.RuneTemplate;
+import engine.server.MBServerStatics;
+import org.pmw.tinylog.Logger;
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 
 public class SkillReq extends AbstractGameObject {
 
+    private static final int DB_SKILL_REQ_AMOUNT = 80;
+    private static final ConcurrentHashMap<Integer, ArrayList<SkillReq>> skillReqsByRune = new ConcurrentHashMap<>(MBServerStatics.CHM_INIT_CAP, MBServerStatics.CHM_LOAD, MBServerStatics.CHM_THREAD_LOW);
 
     private int skillID;
     private short level;
     private ArrayList<Byte> skillReqs;
+    private HashMap<Byte, Integer> skillReqAmounts;
 
 	/* This shouldn't be used
 	public SkillReq(SkillsBase skillsBase, short level, ArrayList<Byte>skillReqs) {
@@ -60,6 +69,7 @@ public class SkillReq extends AbstractGameObject {
         this.skillID = rs.getInt("skillID");
         this.level = rs.getShort("level");
         skillReqs = new ArrayList<>(0);
+        skillReqAmounts = new HashMap<>();
 
         int skillReq;
         skillReq = rs.getInt("skillreq1");
@@ -71,6 +81,64 @@ public class SkillReq extends AbstractGameObject {
         skillReq = rs.getInt("skillreq3");
         if (skillReq > 0)
             skillReqs.add((byte) skillReq);
+
+        // DB rows carry no amount; the server hard-codes 80
+        for (byte reqSkillID : skillReqs)
+            skillReqAmounts.put(reqSkillID, DB_SKILL_REQ_AMOUNT);
+    }
+
+    // skill_value is the level the skill is granted at; skill_granted_skills are prereq skills with amounts
+    public SkillReq(RuneTemplate.SkillGrant skillGrant, SkillsBase skillsBase, int runeID) {
+        super();
+
+        SkillsBase reqSkillsBase;
+
+        this.skillID = skillsBase.getObjectUUID();
+        this.level = (short) skillGrant.skill_value;
+        this.skillReqs = new ArrayList<>(0);
+        this.skillReqAmounts = new HashMap<>();
+
+        for (Map.Entry<String, Integer> reqSkill : skillGrant.skill_granted_skills.entrySet()) {
+
+            reqSkillsBase = DbManager.SkillsBaseQueries.GET_BASE_BY_NAME(reqSkill.getKey());
+
+            if (reqSkillsBase == null) {
+                Logger.warn("Rune " + runeID + " skill grant " + skillGrant.skill_type + ": unknown prereq skill " + reqSkill.getKey());
+                continue;
+            }
+
+            this.skillReqs.add((byte) reqSkillsBase.getObjectUUID());
+            this.skillReqAmounts.put((byte) reqSkillsBase.getObjectUUID(), reqSkill.getValue());
+        }
+    }
+
+    public static ArrayList<SkillReq> getSkillReqsForRune(int runeID) {
+        return skillReqsByRune.computeIfAbsent(runeID, SkillReq::loadSkillReqsForRune);
+    }
+
+    private static ArrayList<SkillReq> loadSkillReqsForRune(int runeID) {
+
+        ArrayList<SkillReq> runeSkillReqs = new ArrayList<>();
+        RuneTemplate rune = RuneTemplate._runes.get(runeID);
+        SkillsBase skillsBase;
+
+        if (rune == null)
+            return runeSkillReqs;
+
+        for (RuneTemplate.SkillGrant skillGrant : rune.rune_skill_grant) {
+
+            skillsBase = DbManager.SkillsBaseQueries.GET_BASE_BY_NAME(skillGrant.skill_type);
+
+            // Archon 2018 grants resistances and Duelist 3010 grants Dueling; neither is a skill
+            if (skillsBase == null) {
+                Logger.warn("Rune " + runeID + ": skill grant " + skillGrant.skill_type + " is not a skill");
+                continue;
+            }
+
+            runeSkillReqs.add(new SkillReq(skillGrant, skillsBase, runeID));
+        }
+
+        return runeSkillReqs;
     }
 
     /*
@@ -92,6 +160,10 @@ public class SkillReq extends AbstractGameObject {
         return this.skillReqs;
     }
 
+    public int getSkillReqAmount(byte reqSkillID) {
+        return this.skillReqAmounts.getOrDefault(reqSkillID, DB_SKILL_REQ_AMOUNT);
+    }
+
 
     @Override
     public void updateDatabase() {