Skills system: practice-grown abilities with passion (animals now, humans later)

Generic data-driven skills (SkillDef + skills.json: Foraging, Hunting, Evasion),
mirroring the needs registry. Skills component (per-skill level [0..1] + passion)
on every animal, built by AnimalFactory; passion is rolled deterministically from
the genome (no RNG param threaded). Levels grow from PRACTICE (XP on the matching
action, scaled by passion''s learn-rate) and slowly decay toward a floor when
unused (AnimalSkillSystem), so animals specialize.

Effects wired now: Foraging -> satiety from grazing, Hunting -> attack damage,
Evasion -> flee speed. A missing skill def -> factor 1 (no effect), so it is safe
to mod the set. Inspector gains a Skills tab (level% + passion stars); `skills`
console command shows live mean levels; skills are saved/loaded (levels+passions).
Same model will carry to future humans. Build + --check-content clean.

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

Mods/Core/Languages/en/ui.json

@@ -11,6 +11,7 @@
   "inspect.tab.genes": "Genes",
   "inspect.tab.products": "Products",
   "inspect.tab.needs": "Needs",
+  "inspect.tab.skills": "Skills",
   "inspect.tab.health": "Health",
   "inspect.tab.mood": "Mood",
   "inspect.stage": "Stage: {0} ({1}/{2})",
@@ -42,6 +43,10 @@
   "inspect.animal.sex": "Sex: {0} · generation {1}",
   "inspect.animal.pregnant": "Pregnant: {0:0.0} d to birth",
   "inspect.needline": "{0}: {1:0}%",
+  "inspect.skillline": "{0}: {1:0}% {2}",
+  "skill.foraging": "foraging",
+  "skill.hunting": "hunting",
+  "skill.evasion": "evasion",
   "inspect.health.blood": "Blood: {0:0}% · pain: {1:0}%",
   "inspect.health.caps": "— Capacities —",
   "inspect.health.cap": "{0}: {1:0}%",