feat(animation): 452 named constants, 30-phase character animation state machine

Add animation_ids.hpp/cpp with all 452 WoW animation ID constants (anim::STAND,
anim::RUN, anim::FIRE_BOW, ... anim::FLY_BACKWARDS, etc.), nameFromId() O(1)
lookup, and flyVariant() compact 218-element ground→FLY_* resolver.

Expand AnimationController into a full state machine with 20+ named states:
spell cast (directed→omni→cast fallback chain, instant one-shot release),
hit reactions (WOUND/CRIT/DODGE/BLOCK/SHIELD_BLOCK), stun, wounded idle,
stealth animation substitution, loot, fishing channel, sit/sleep/kneel
down→loop→up transitions, sheathe/unsheathe combat enter/exit, ranged weapons
(BOW/GUN/CROSSBOW/THROWN with reload states), game object OPEN/CLOSE/DESTROY,
vehicle enter/exit, mount flight directionals (FLY_LEFT/RIGHT/UP/DOWN/BACKWARDS),
emote state variants, off-hand/pierce/dual-wield alternation, NPC
birth/spawn/drown/rise, sprint aura override, totem idle, NPC greeting/farewell.

Add spell_defines.hpp with SpellEffect (~45 constants) and SpellMissInfo
(12 constants) namespaces; replace all magic numbers in spell_handler.cpp.

Add GAMEOBJECT_BYTES_1 to update field table (all 4 expansion JSONs) and wire
GameObjectStateCallback. Add DBC cross-validation on world entry.

Expand tools/_ANIM_NAMES from ~35 to 452 entries in m2_viewer.py and
asset_pipeline_gui.py. Add tests/test_animation_ids.cpp.

Bug fixes included:
- Stand state 1 was animating READY_2H(27) — fixed to SITTING(97)
- Spell casts ended freeze-frame — add one-shot release animation
- NPC 2H swing probe chain missing ATTACK_2H_LOOSE (polearm/staff)
- Chair sits (states 2/4/5/6) incorrectly played floor-sit transition
- STOP(3) used for all spell casts — replaced with model-aware chain

include/rendering/terrain_renderer.hpp

@@ -60,7 +60,7 @@ struct TerrainChunkGPU {
     float boundingSphereRadius = 0.0f;
     glm::vec3 boundingSphereCenter = glm::vec3(0.0f);
 
-    // Phase 2.2: Offsets into mega buffers for indirect drawing (-1 = not in mega buffer)
+    // Offsets into mega buffers for indirect drawing (-1 = not in mega buffer)
     int32_t megaBaseVertex = -1;
     uint32_t megaFirstIndex = 0;
     uint32_t vertexCount = 0;
@@ -206,7 +206,7 @@ private:
     int renderedChunks = 0;
     int culledChunks = 0;
 
-    // Phase 2.2: Mega vertex/index buffers for indirect drawing
+    // Mega vertex/index buffers for indirect drawing
     // All terrain chunks share a single VB + IB, eliminating per-chunk rebinds.
     // Indirect draw commands are built CPU-side each frame for visible chunks.
     VkBuffer megaVB_ = VK_NULL_HANDLE;