Animal thermoregulation (insulation) + wound infection

Two health threads finished, both via the existing hediff engine in
AnimalHealthSystem (now also takes Climate + the new hediff defs):

- Thermoregulation revives the dead GeneInsulation. A comfort band is derived
  per animal: fur (insulation) widens cold tolerance but worsens heat tolerance,
  larger body resists cold. Outside it, Hypothermia/Heatstroke severity builds
  (Poisoned-pattern: Intensify zeroes immunity so it can't recover while still
  exposed), capacities drop, severity 1 = death; back in comfort it heals.
  Seasonal/climate mortality and a real cold↔heat adaptation tradeoff.
- Wound infection marries the injury and disease systems: while bleeding, a
  chance (∝ wound severity) to contract Infection, a progressing disease fought
  by immunity × blood filtration — weak kidneys/liver or many wounds = worse.

New hediffs Hypothermia/Heatstroke/Infection (+ru/en). Build + --check-content
clean. Not GUI-verified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Mods/Core/Languages/en/ui.json

@@ -73,6 +73,9 @@
   "hediff.fever": "fever",
   "hediff.bleeding": "bleeding",
   "hediff.poisoned": "poisoned",
+  "hediff.hypothermia": "hypothermia",
+  "hediff.heatstroke": "heatstroke",
+  "hediff.infection": "infection",
   "inspect.hint": "LMB — select · RMB/Esc — clear",
   "hud.paused": "PAUSED",
   "menu.title": "LittleSim",

Mods/Core/Languages/ru/ui.json

@@ -73,6 +73,9 @@
   "hediff.fever": "лихорадка",
   "hediff.bleeding": "кровотечение",
   "hediff.poisoned": "отравление",
+  "hediff.hypothermia": "переохлаждение",
+  "hediff.heatstroke": "тепловой удар",
+  "hediff.infection": "заражение",
   "inspect.hint": "ЛКМ — выбрать · ПКМ/Esc — снять",
   "hud.paused": "ПАУЗА",
   "menu.title": "LittleSim",