fix: spire combat 11 high-severity discrepancies (issue #333)

D-01: Implement per-weapon cast progress (weaponCastProgress record)
D-04: Bypass Executioner/Berserker discipline specials for golem attacks
D-09: Fix lightning counter direction (lightning→water, not lightning→earth)
D-10: Add full composite element counters (blackflame/radiantflames ↔ frost/water/light/dark)
D-15: Fix Executioner to check per-enemy HP < 25% instead of floorHP ratio
D-20: Fix dodge formula to match spec (min(0.55, floor × 0.003), starts at 0)
D-22: Fix shield modifier to use flat HP pool instead of percentage barrier
D-23: Wire up applyMageBarrierRecharge in the damage pipeline
D-25: Move guardian regen from per-damage-event to once-per-tick
D-26: Add guardian armor reduction to the guardian defensive pipeline
D-31: Fix armor_corrode to be temporary (restore armor on effect expiry)
D-38: Implement AoE damage distribution across enemies

All 1069 tests pass. No files exceed 400 lines.

src/lib/game/utils/combat-utils.ts

@@ -33,19 +33,20 @@ export interface DPSCalcParams {
 }
 
 // ─── Elemental Damage Bonus ──────────────────────────────────────────────────
-
-// Elemental damage bonus: +50% if spell element opposes floor element (super effective)
+// +50% if spell element opposes floor element (super effective)
 // -25% if spell element matches its own opposite (weak)
 export function getElementalBonus(spellElem: string, floorElem: string): number {
   if (spellElem === 'raw') return 1.0; // Raw mana has no elemental bonus
 
   if (spellElem === floorElem) return 1.25; // Same element: +25% damage
 
-  // Check for super effective first: spell is the opposite of floor
-  if (ELEMENT_OPPOSITES[floorElem] === spellElem) return 1.5; // Super effective: +50% damage
+  // Check for super effective: spellElem is in floorElem's opposites list
+  const floorOpposites = ELEMENT_OPPOSITES[floorElem];
+  if (floorOpposites && floorOpposites.includes(spellElem)) return 1.5; // Super effective: +50% damage
 
-  // Check for weak: spell's opposite matches floor
-  if (ELEMENT_OPPOSITES[spellElem] === floorElem) return 0.75; // Weak: -25% damage
+  // Check for weak: floorElem is in spellElem's opposites list
+  const spellOpposites = ELEMENT_OPPOSITES[spellElem];
+  if (spellOpposites && spellOpposites.includes(floorElem)) return 0.75; // Weak: -25% damage
 
   return 1.0; // Neutral
 }