Merge branch 'animals' into main: animal/zoology system (A1-A8 + serialization)

Brings the full animal foundation onto main and folds its new defs into the
Defs/ subfolder layout introduced on main:
- animal genes -> Defs/Genes/Animal.json (split out of genes.json)
- animals/bodies/hediffs/needs/thoughts -> own Defs/<Type>/ subfolders
- ProductMeat/Bone/Leather + bigger world presets auto-merged via rename detection
- PawnDef un-sealed (AnimalDef : PawnDef); def-location doc comments updated to subfolders
- engine pointer kept at main's newer 96e19c7 (only adds directional sun shadows)

Build + --check-content clean: 11 def types, 33 genes, 35 plants, 32 traits.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Mods/Core/Defs/Animals/Animals.json

@@ -0,0 +1,35 @@
+{
+  "type": "Animal",
+  // Виды-животные (фаза A1): подтип Pawn (kind=animal) + базовый геном вида из общих Gene-дефов
+  // (см. genes.json). Особь при спавне получает аллели вокруг этих баз, фенотип — формулами генов.
+  // Пол, стадии роста, размножение, здоровье и поведение приходят в фазах A2+.
+  "defs": [
+    {
+      "defName": "Deer",
+      "label": "pawn.deer",
+      "kind": "animal",
+      "texture": "things/pawn/animal/deer/DeerFemale_east",
+      "maleTexture": "things/pawn/animal/deer/DeerMale_east",
+      "babyTexture": "things/pawn/animal/deer/DeerBaby_east",
+      "corpseTexture": "things/pawn/animal/deer/Dessicated_DeerFemale_east",
+      "body": "Quadruped",
+      "diet": ["plant"],
+      "spawnPer1000Cells": 2.5,
+      "genome": {
+        "GeneMaxBodySize": 1.5,
+        "GeneMetabolism": 1.0,
+        "GeneMoveSpeed": 1.2,
+        "GeneBloodVolume": 1.4,
+        "GeneVision": 1.3,
+        "GeneBrainSize": 0.45,
+        "GeneInsulation": 0.55,
+        "GeneFurColor": 0.45,
+        "GeneMaturityAge": 90,
+        "GeneLifespan": 360,
+        "GeneBreedingSeason": 2,
+        "GeneGestationDays": 30,
+        "GeneLitterSize": 1
+      }
+    }
+  ]
+}