fix: Golemancy enchantment capacity, design persistence, and UI selectors

- Fix enchantment capacity formula: multiply magicAffinity by 100 (spec treats it as percentage)
- Fix enterSpireMode preserving golemDesigns (only reset loadout/activeGolems per spec §9)
- Add mana type selector UI for Intermediate/Advanced/Guardian cores
- Add spell selector UI for circuits with spell slots

Fixes #310, #311, #312

src/components/game/tabs/GolemancyTab.tsx

@@ -35,6 +35,7 @@ export const GolemancyTab: React.FC = () => {
   const [selectedEnchantmentIds, setSelectedEnchantmentIds] = useState<string[]>([]);
   const [designName, setDesignName] = useState('');
   const [selectedManaTypes, setSelectedManaTypes] = useState<string[]>([]);
+  const [selectedSpells, setSelectedSpells] = useState<string[]>([]);
 
   // Store access
   const { golemancy, addGolemDesign, removeGolemDesign, toggleGolemLoadoutEntry } = useCombatStore(
@@ -117,10 +118,10 @@ export const GolemancyTab: React.FC = () => {
     if (!selectedCore || !selectedFrame || !selectedCircuit) return null;
     const design = buildGolemDesign(
       selectedCore, selectedFrame, selectedCircuit,
-      selectedEnchantments, selectedManaTypes, [],
+      selectedEnchantments, selectedManaTypes, selectedSpells,
     );
     return computeGolemStats(design);
-  }, [selectedCore, selectedFrame, selectedCircuit, selectedEnchantments, selectedManaTypes]);
+  }, [selectedCore, selectedFrame, selectedCircuit, selectedEnchantments, selectedManaTypes, selectedSpells]);
 
   const affordability = useMemo(() => {
     if (!selectedCore || !selectedFrame || !selectedCircuit) {
@@ -128,10 +129,10 @@ export const GolemancyTab: React.FC = () => {
     }
     const design = buildGolemDesign(
       selectedCore, selectedFrame, selectedCircuit,
-      selectedEnchantments, selectedManaTypes, [],
+      selectedEnchantments, selectedManaTypes, selectedSpells,
     );
     return canAffordGolemDesign(design, rawMana, elements);
-  }, [selectedCore, selectedFrame, selectedCircuit, selectedEnchantments, selectedManaTypes, rawMana, elements]);
+  }, [selectedCore, selectedFrame, selectedCircuit, selectedEnchantments, selectedManaTypes, selectedSpells, rawMana, elements]);
 
   // Enchantment capacity check
   const enchantmentCapacity = computedStats?.enchantmentCapacity ?? 0;
@@ -144,18 +145,38 @@ export const GolemancyTab: React.FC = () => {
     );
   }, []);
 
+  const handleToggleManaType = useCallback((type: string) => {
+    setSelectedManaTypes(prev => {
+      if (prev.includes(type)) return prev.filter(t => t !== type);
+      const core = selectedCoreId ? CORES[selectedCoreId] : null;
+      const slots = core?.id === 'intermediate' ? 2 : core?.id === 'advanced' ? 3 : core?.id === 'guardian' ? 4 : 0;
+      if (prev.length >= slots) return prev;
+      return [...prev, type];
+    });
+  }, [selectedCoreId]);
+
+  const handleToggleSpell = useCallback((spellName: string) => {
+    setSelectedSpells(prev => {
+      if (prev.includes(spellName)) return prev.filter(s => s !== spellName);
+      const slots = selectedCircuit?.spellSlots ?? 0;
+      if (prev.length >= slots) return prev;
+      return [...prev, spellName];
+    });
+  }, [selectedCircuit]);
+
   const handleSaveDesign = useCallback(() => {
     if (!selectedCore || !selectedFrame || !selectedCircuit) return;
     const name = designName.trim() || `${selectedCore.name.split(' ')[0]} ${selectedFrame.name.split(' ')[0]}`;
     const serialized = serializeDesign(
       name, selectedCore, selectedFrame, selectedCircuit,
-      selectedEnchantments, selectedManaTypes, [],
+      selectedEnchantments, selectedManaTypes, selectedSpells,
     );
     addGolemDesign(serialized);
     setDesignName('');
     setSelectedEnchantmentIds([]);
     setSelectedManaTypes([]);
-  }, [designName, selectedCore, selectedFrame, selectedCircuit, selectedEnchantments, selectedManaTypes, addGolemDesign]);
+    setSelectedSpells([]);
+  }, [designName, selectedCore, selectedFrame, selectedCircuit, selectedEnchantments, selectedManaTypes, selectedSpells, addGolemDesign]);
 
   const handleRemoveLoadoutEntry = useCallback((designId: string) => {
     removeGolemDesign(designId);
@@ -209,6 +230,7 @@ export const GolemancyTab: React.FC = () => {
           selectedFrameId={selectedFrameId}
           selectedCircuitId={selectedCircuitId}
           selectedEnchantmentIds={selectedEnchantmentIds}
+          selectedSpells={selectedSpells}
           designName={designName}
           selectedManaTypes={selectedManaTypes}
           unlockedCoreIds={unlockedCoreIds}
@@ -224,6 +246,8 @@ export const GolemancyTab: React.FC = () => {
           onSelectFrame={setSelectedFrameId}
           onSelectCircuit={setSelectedCircuitId}
           onToggleEnchantment={handleToggleEnchantment}
+          onToggleSpell={handleToggleSpell}
+          onToggleManaType={handleToggleManaType}
           onDesignNameChange={setDesignName}
           onSaveDesign={handleSaveDesign}
         />

src/components/game/tabs/golemancy/GolemDesignBuilder.tsx

@@ -11,6 +11,8 @@ import type {
   GolemEnchantmentDefinition, ComputedGolemStats,
 } from '@/lib/game/data/golems/types';
 import { ELEMENTS } from '@/lib/game/constants/elements';
+import { SPELLS_DEF } from '@/lib/game/constants/spells';
+import type { SpellDef } from '@/lib/game/types/spells';
 import { ScrollArea } from '@/components/ui/scroll-area';
 import clsx from 'clsx';
 import { formatRequirement } from './golemancy-utils';
@@ -21,6 +23,7 @@ export interface GolemDesignBuilderProps {
   selectedFrameId: string | null;
   selectedCircuitId: string | null;
   selectedEnchantmentIds: string[];
+  selectedSpells: string[];
   designName: string;
   selectedManaTypes: string[];
   unlockedCoreIds: Set<string>;
@@ -36,16 +39,30 @@ export interface GolemDesignBuilderProps {
   onSelectFrame: (id: string) => void;
   onSelectCircuit: (id: string) => void;
   onToggleEnchantment: (id: string) => void;
+  onToggleSpell: (id: string) => void;
+  onToggleManaType: (type: string) => void;
   onDesignNameChange: (name: string) => void;
   onSaveDesign: () => void;
 }
 
+/** How many mana types a core tier allows the player to pick */
+function coreManaTypeSlots(core: CoreDefinition | null): number {
+  if (!core) return 0;
+  switch (core.id) {
+    case 'intermediate': return 2;
+    case 'advanced': return 3;
+    case 'guardian': return 4;
+    default: return 0; // basic = fixed earth
+  }
+}
+
 export const GolemDesignBuilder: React.FC<GolemDesignBuilderProps> = ({
   selectedCoreId, selectedFrameId, selectedCircuitId,
-  selectedEnchantmentIds, designName, selectedManaTypes,
+  selectedEnchantmentIds, selectedSpells, designName, selectedManaTypes,
   unlockedCoreIds, unlockedFrameIds, unlockedCircuitIds,
   computedStats, affordability, enchantmentCapacity, usedEnchantmentCapacity,
   onSelectCore, onSelectFrame, onSelectCircuit, onToggleEnchantment,
+  onToggleSpell, onToggleManaType,
   onDesignNameChange, onSaveDesign,
 }) => {
   const canSaveDesign = selectedCoreId && selectedFrameId && selectedCircuitId && affordability.canAfford;
@@ -53,6 +70,23 @@ export const GolemDesignBuilder: React.FC<GolemDesignBuilderProps> = ({
   const selectedFrame = selectedFrameId ? FRAMES[selectedFrameId] ?? null : null;
   const selectedCircuit = selectedCircuitId ? MIND_CIRCUITS[selectedCircuitId] ?? null : null;
 
+  const manaSlots = coreManaTypeSlots(selectedCore);
+  const showManaSelector = manaSlots > 0;
+  const showSpellSelector = (selectedCircuit?.spellSlots ?? 0) > 0;
+  const spellSlots = selectedCircuit?.spellSlots ?? 0;
+
+  // Filter spells to only those whose element matches selected mana types
+  const availableSpells = React.useMemo(() => {
+    if (!showSpellSelector || selectedManaTypes.length === 0) return [];
+    const spells: SpellDef[] = [];
+    for (const spell of Object.values(SPELLS_DEF)) {
+      if (selectedManaTypes.includes(spell.elem)) {
+        spells.push(spell);
+      }
+    }
+    return spells;
+  }, [showSpellSelector, selectedManaTypes]);
+
   return (
     <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
       <ScrollArea className="h-[560px] rounded border border-gray-700 p-3">
@@ -79,6 +113,34 @@ export const GolemDesignBuilder: React.FC<GolemDesignBuilderProps> = ({
               </div>
             )} />
 
+          {/* Mana Type Selector — shown for Intermediate / Advanced / Guardian cores */}
+          {showManaSelector && (
+            <div className="space-y-2">
+              <h4 className="text-sm font-semibold text-gray-300">
+                1b. Select Mana Types
+                <span className="text-gray-500 font-normal ml-2">
+                  {selectedManaTypes.length}/{manaSlots} selected
+                </span>
+              </h4>
+              <div className="grid grid-cols-2 gap-1.5">
+                {Object.entries(ELEMENTS).map(([key, elem]) => {
+                  const isSelected = selectedManaTypes.includes(key);
+                  const canSelect = isSelected || selectedManaTypes.length < manaSlots;
+                  return (
+                    <button key={key} onClick={() => onToggleManaType(key)} disabled={!canSelect}
+                      className={clsx('text-left rounded px-3 py-1.5 text-xs transition-colors flex items-center gap-2',
+                        isSelected ? 'bg-blue-600/30 border border-blue-500 text-blue-200'
+                          : canSelect ? 'bg-gray-800/60 border border-gray-700 text-gray-300 hover:bg-gray-700/60'
+                          : 'bg-gray-900/40 border border-gray-800 text-gray-600 cursor-not-allowed')}>
+                      <span>{elem.sym}</span>
+                      <span>{elem.name}</span>
+                    </button>
+                  );
+                })}
+              </div>
+            </div>
+          )}
+
           <ComponentSelector label="2. Frame (Combat Body)" items={ALL_FRAMES} selectedId={selectedFrameId} unlockedIds={unlockedFrameIds} onSelect={onSelectFrame}
             renderItem={(frame: FrameDefinition, unlocked: boolean) => (
               <div>
@@ -110,6 +172,46 @@ export const GolemDesignBuilder: React.FC<GolemDesignBuilderProps> = ({
               </div>
             )} />
 
+          {/* Spell Selector — shown when circuit has spell slots */}
+          {showSpellSelector && (
+            <div className="space-y-2">
+              <h4 className="text-sm font-semibold text-gray-300">
+                3b. Select Spells
+                <span className="text-gray-500 font-normal ml-2">
+                  {selectedSpells.length}/{spellSlots} selected
+                </span>
+              </h4>
+              {selectedManaTypes.length === 0 ? (
+                <p className="text-xs text-yellow-400">Select mana types on the core first to see available spells.</p>
+              ) : availableSpells.length === 0 ? (
+                <p className="text-xs text-gray-500">No spells available for selected mana types.</p>
+              ) : (
+                <div className="grid grid-cols-1 gap-1.5">
+                  {availableSpells.map(spell => {
+                    const isSelected = selectedSpells.includes(spell.name);
+                    const canSelect = isSelected || selectedSpells.length < spellSlots;
+                    const elemDef = ELEMENTS[spell.elem];
+                    return (
+                      <button key={spell.name} onClick={() => onToggleSpell(spell.name)} disabled={!canSelect}
+                        className={clsx('text-left rounded px-3 py-2 text-xs transition-colors',
+                          isSelected ? 'bg-green-600/30 border border-green-500 text-green-200'
+                            : canSelect ? 'bg-gray-800/60 border border-gray-700 text-gray-300 hover:bg-gray-700/60'
+                            : 'bg-gray-900/40 border border-gray-800 text-gray-600 cursor-not-allowed')}>
+                        <div className="flex items-center justify-between">
+                          <span className="font-medium">{spell.name}</span>
+                          <span className="text-gray-500">
+                            {elemDef?.sym} {spell.elem} · {spell.dmg} dmg · {spell.cost.amount} {spell.cost.type === 'raw' ? 'raw' : spell.cost.element}
+                          </span>
+                        </div>
+                        {spell.desc && <p className="text-gray-500 mt-0.5">{spell.desc}</p>}
+                      </button>
+                    );
+                  })}
+                </div>
+              )}
+            </div>
+          )}
+
           {selectedCore && selectedFrame && selectedCircuit && (
             <div className="space-y-2">
               <h4 className="text-sm font-semibold text-gray-300">4. Enchantments (Optional)

src/components/game/tabs/golemancy/GolemancyComponents.test.ts

@@ -33,8 +33,8 @@ describe('computeGolemStats', () => {
     // Circuit-derived stats
     expect(stats.spellSlots).toBe(0);
 
-    // Enchantment capacity = frame.magicAffinity * core.tierMultiplier
-    expect(stats.enchantmentCapacity).toBeCloseTo(0.3 * 1.0);
+    // Enchantment capacity = Math.round(frame.magicAffinity * 100) * core.tierMultiplier
+    expect(stats.enchantmentCapacity).toBeCloseTo(Math.round(0.3 * 100) * 1.0);
 
     // Special effect from frame
     expect(stats.specialEffect).toBe('none');
@@ -74,8 +74,8 @@ describe('computeGolemStats', () => {
     // Circuit-derived stats
     expect(stats.spellSlots).toBe(2);
 
-    // Enchantment capacity = frame.magicAffinity * core.tierMultiplier
-    expect(stats.enchantmentCapacity).toBeCloseTo(0.5 * 2.0);
+    // Enchantment capacity = Math.round(frame.magicAffinity * 100) * core.tierMultiplier
+    expect(stats.enchantmentCapacity).toBeCloseTo(Math.round(0.5 * 100) * 2.0);
 
     // Selected mana types override core defaults
     expect(stats.availableManaTypes).toEqual(['crystal', 'metal', 'fire']);

src/lib/game/data/golems/golemancy-data.test.ts

@@ -136,7 +136,7 @@ describe('Computed stats', () => {
     expect(stats.magicAffinity).toBe(0.3);
     expect(stats.aoeTargets).toBe(1);
     expect(stats.spellSlots).toBe(0);
-    expect(stats.enchantmentCapacity).toBeCloseTo(0.3);
+    expect(stats.enchantmentCapacity).toBeCloseTo(30); // Earth Frame 30% × Basic Core 1.0
     expect(stats.specialEffect).toBe('none');
     expect(stats.availableManaTypes).toEqual(['earth']);
   });
@@ -153,7 +153,7 @@ describe('Computed stats', () => {
     expect(stats.armorPierce).toBe(0.5);
     expect(stats.magicAffinity).toBe(0.5);
     expect(stats.spellSlots).toBe(2);
-    expect(stats.enchantmentCapacity).toBeCloseTo(1.0);
+    expect(stats.enchantmentCapacity).toBeCloseTo(100); // Steel Frame 50% × Advanced Core 2.0
   });
 
   it('guardian crystalSteelHybrid golem with guardian circuit', () => {
@@ -168,7 +168,7 @@ describe('Computed stats', () => {
     expect(stats.armorPierce).toBe(0.7);
     expect(stats.magicAffinity).toBe(1.0);
     expect(stats.spellSlots).toBe(4);
-    expect(stats.enchantmentCapacity).toBeCloseTo(3.0);
+    expect(stats.enchantmentCapacity).toBeCloseTo(300); // Crystal-Steel Hybrid 100% × Guardian Core 3.0
     expect(stats.specialEffect).toBe('guardianConstruct');
   });
 

src/lib/game/data/golems/utils.ts

@@ -90,8 +90,9 @@ export function computeGolemStats(design: GolemDesign): ComputedGolemStats {
     },
   ];
 
-  // Enchantment capacity = Frame.MagicAffinity × Core.TierMultiplier
-  const enchantmentCapacity = frame.magicAffinity * core.tierMultiplier;
+  // Enchantment capacity = Frame.MagicAffinity(%) × Core.TierMultiplier
+  // magicAffinity is stored as decimal (0.3 = 30%) per spec §5.1, so multiply by 100
+  const enchantmentCapacity = Math.round(frame.magicAffinity * 100) * core.tierMultiplier;
 
   return {
     maxRoomDuration: core.maxRoomDuration,

src/lib/game/stores/combat-descent-actions.ts

@@ -253,7 +253,7 @@ export function createEnterSpireMode(get: GetFn, set: SetFn) {
       roomResetState: {},
       descentPeak: null,
       isDescentComplete: false,
-      golemancy: { activeGolems: [], lastSummonFloor: 0, golemDesigns: {}, golemLoadout: [] },
+      golemancy: { activeGolems: [], lastSummonFloor: 0, golemDesigns: s.golemancy?.golemDesigns ?? {}, golemLoadout: [] },
     });
 
     get().addActivityLog('floor_transition',