fix(#165,#166,#167,#168,#169,#171,#172): resolve 7 open bug issues

#172 - Grimoire tab: removed dead 'loaded' state guard that permanently showed loading
#169 - Transference Mana Flow: added elements param to checkDisciplinePrerequisites so mana type unlocks are verified
#168 - Perk descriptions: wired 4 broken perks (enchant-2, channel-1, golem-2, efficiency-1) with actual bonus effects; fixed enchant-1 interval (5→50); fixed study-mana-enchantments stat (maxMana→maxManaBonus)
#171 - Shields: removed all shield equipment (4 types), recipes, category, slot mappings; added 'shields' to AGENTS.md banned list
#166 - regenMultiplier: merged disciplineEffects.multipliers.regenMultiplier into computeAllEffects()
#165 - Meditation cap: added meditationCap display to ManaStatsSection UI; updated perk description
#167 - XP accumulation: added Meditative Mastery base discipline with disciplineXpBonus stat; wired into tick pipeline

src/app/components/GrimoireTab.tsx

@@ -9,7 +9,6 @@ import type { SpellDef } from '@/lib/game/types';
 
 export function GrimoireTab() {
   const [grimoireSpells, setGrimoireSpells] = useState<[string, SpellDef][]>([]);
-  const [loaded, _setLoaded] = useState(false);
 
   useEffect(() => {
     if (typeof window !== 'undefined' && SPELLS_DEF) {
@@ -20,10 +19,6 @@ export function GrimoireTab() {
     }
   }, []);
 
-  if (!loaded) {
-    return <div className="p-4 text-center text-gray-400">Loading grimoire...</div>;
-  }
-
   if (grimoireSpells.length === 0) {
     return (
       <div className="p-4 text-center text-gray-400">