Adv 2.0 D&D Phase 11 D1a: zone registry + Tier 1 zones

Zone Infrastructure SUB-A: ZoneDefinition / ZoneTier / ZoneEnemy /
ZoneBoss / ZoneLootEntry types and dndZoneRegistry. Tier 1 zones
populated per gogobee_dungeon_zones.md §5: Goblin Warrens (T1, L1-3,
boss Grol the Unbroken CR3) and Crypt of Valdris (T1, L1-3, boss
Valdris the Unburied CR5, phase 2 at 50% HP).

Helpers: getZone, zonesForLevel (2-tier-above ceiling), zonesByTier,
allZones.

Bestiary additions for Tier 1 enemy rosters: goblin_sneak,
goblin_archer, hobgoblin_grunt, worg, goblin_shaman,
hobgoblin_warchief, zombie, shadow, specter, wight, flameskull, plus
the two zone bosses. Zombie AC bumped 8->10 to satisfy engine
TestBestiaryAllWellFormed minimum.

7 new tests covering registry presence, bestiary-ref resolution, boss
CR floor, level-tier gating, loot-chance bounds, room-count sanity,
elite flag presence, and tier->level-range alignment. Full plugin
suite green.

Also marks SUB3 done in gogobee_subclass_system.md (all 15 subclasses
through L15 shipped across SUB3a-d).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

gogobee_subclass_system.md

@@ -249,10 +249,10 @@ Each subclass selection triggers a TwinBee narration line and a one-line flavor
 - [x] Berserker Rage mechanic and Exhaustion tracking
 
 ### Phase SUB3 — Advanced Abilities
-- [ ] Level 10 and 15 abilities per subclass
-- [ ] Battle Master maneuver dice system
-- [ ] Arcane Trickster spellcasting integration
-- [ ] Beast Master full combat pet participation
+- [x] Level 10 and 15 abilities per subclass (all 15 subclasses)
+- [x] Battle Master maneuver dice system (SUB2a-ii)
+- [x] Arcane Trickster spellcasting integration (SUB2-AT)
+- [x] Beast Master full combat pet participation (SUB3d Superior Bond)
 
 ---
 *End of Subclass System.*