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

assets/shaders/character.frag.glsl

@@ -176,7 +176,7 @@ void main() {
             if (proj.x >= 0.0 && proj.x <= 1.0 &&
                 proj.y >= 0.0 && proj.y <= 1.0 &&
                 proj.z >= 0.0 && proj.z <= 1.0) {
-                float bias = max(0.0005 * (1.0 - dot(norm, ldir)), 0.00005);
+                float bias = max(0.0005 * (1.0 - abs(dot(norm, ldir))), 0.00005);
                 shadow = sampleShadowPCF(uShadowMap, vec3(proj.xy, proj.z - bias));
             }
             shadow = mix(1.0, shadow, shadowParams.y);

assets/shaders/m2.vert.glsl

@@ -13,7 +13,7 @@ layout(set = 0, binding = 0) uniform PerFrame {
     vec4 shadowParams;
 };
 
-// Phase 2.1: Per-draw push constants (batch-level data only)
+// Per-draw push constants (batch-level data only)
 layout(push_constant) uniform Push {
     int texCoordSet;         // UV set index (0 or 1)
     int isFoliage;           // Foliage wind animation flag
@@ -24,7 +24,7 @@ layout(set = 2, binding = 0) readonly buffer BoneSSBO {
     mat4 bones[];
 };
 
-// Phase 2.1: Per-instance data read via gl_InstanceIndex (GPU instancing)
+// Per-instance data read via gl_InstanceIndex (GPU instancing)
 struct InstanceData {
     mat4 model;
     vec2 uvOffset;
@@ -51,7 +51,7 @@ layout(location = 4) out float ModelHeight;
 layout(location = 5) out float vFadeAlpha;
 
 void main() {
-    // Phase 2.1: Fetch per-instance data from SSBO
+    // Fetch per-instance data from SSBO
     int instIdx = push.instanceDataOffset + gl_InstanceIndex;
     mat4 model = instanceData[instIdx].model;
     vec2 uvOff = instanceData[instIdx].uvOffset;

assets/shaders/m2_cull.comp.glsl

@@ -1,6 +1,6 @@
 #version 450
 
-// Phase 2.3: GPU Frustum Culling for M2 doodads
+// GPU Frustum Culling for M2 doodads
 // Each compute thread tests one M2 instance against 6 frustum planes.
 // Input:  per-instance bounding sphere + flags.
 // Output: uint visibility array (1 = visible, 0 = culled).

assets/shaders/terrain.frag.glsl

@@ -116,8 +116,8 @@ void main() {
         vec4 lsPos = lightSpaceMatrix * vec4(biasedPos, 1.0);
         vec3 proj = lsPos.xyz / lsPos.w;
         proj.xy = proj.xy * 0.5 + 0.5;
-        if (proj.x >= 0.0 && proj.x <= 1.0 && proj.y >= 0.0 && proj.y <= 1.0 && proj.z <= 1.0) {
-            float bias = 0.0002;
+        if (proj.x >= 0.0 && proj.x <= 1.0 && proj.y >= 0.0 && proj.y <= 1.0 && proj.z >= 0.0 && proj.z <= 1.0) {
+            float bias = max(0.0005 * (1.0 - abs(dot(norm, ldir))), 0.00005);
             shadow = sampleShadowPCF(uShadowMap, vec3(proj.xy, proj.z - bias));
             shadow = mix(1.0, shadow, shadowParams.y);
         }

assets/shaders/wmo.frag.glsl

@@ -176,7 +176,7 @@ void main() {
         if (proj.x >= 0.0 && proj.x <= 1.0 &&
             proj.y >= 0.0 && proj.y <= 1.0 &&
             proj.z >= 0.0 && proj.z <= 1.0) {
-            float bias = max(0.0005 * (1.0 - dot(norm, ldir)), 0.00005);
+            float bias = max(0.0005 * (1.0 - abs(dot(norm, ldir))), 0.00005);
             shadow = sampleShadowPCF(uShadowMap, vec3(proj.xy, proj.z - bias));
         }
         shadow = mix(1.0, shadow, shadowParams.y);