Stack a mob's rune skill adjusts by skill type instead of replacing them

applyRuneSkills checked mob.skills for the rune name rather than the skill
type, so every qualifying [rank, level] pair replaced the skill and only
the last one counted. Pairs at or below the mob's level now add up, the
same way trainer caps sum their pairs.

Value changes: only mobbases with several pairs for one skill, Guard Dog
12017 and Guard 13170. Only Guard Dog is in use (contract 910 Personal
Guard Dog); Guard 13170 has no spawns or contracts on dev. Example at
level 50: Dodge and Unarmed Combat 30 -> 110, Unarmed Combat Mastery
20 -> 80. Guard ATR/defense/damage formulas don't read these skills.
No mobbase has a base skill matching a rune skill, so applyMobbaseSkill
values are unaffected.

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

src/engine/gameManager/NPCManager.java

@@ -471,7 +471,7 @@ public enum NPCManager {
                 if (skillBase == null)
                     continue;
                 if (entry.level <= mob.level)
-                    if (mob.skills.containsKey(entry.name) == false)
+                    if (mob.skills.containsKey(entry.skill_type) == false)
                         mob.skills.put(entry.skill_type, new CharacterSkill(skillBase, mob, entry.rank));
                     else
                         mob.skills.put(entry.skill_type, new CharacterSkill(skillBase, mob, entry.rank + mob.skills.get(entry.skill_type).getNumTrains()));