Adv 2.0 D&D Phase 10 SUB3c: Cleric L10/L15

Life/War/Trickery Domain L10/L15 capstones.

L10 Divine Strike (all 3 subclasses): +4 flat per weapon hit, scaling
to +9 at L14. New CombatModifiers.DivineStrikePerHit channel, gated on
Weapon != nil since 5e specs "weapon hit". Damage type (radiant/weapon/
poison) varies by domain but isn't tracked by the engine.

Life L15 Supreme Healing: heal-spell dice resolve at max instead of
rolled. Wired through resolveHealOutOfCombat via lifeDomainSupremeHealing
helper.

War L15 Avatar of Battle: 5e physical resistance vs. non-magical
weapons → flat 0.80 DamageReduct (softer than full 50% to account for
elemental hits).

Trickery L15 Improved Duplicity: 5e duplicates grant ally-flank
advantage; no allies in 1v1, so proxied passively as +1 SporeCloud
round and +5% damage (duplicates flicker around the foe).

10 new tests; cleric-suite green. Pre-existing rng flakes
(TestOrcRageFiresOnLowHP, TestSimulateCombat_FirstAttackBonus...) are
unrelated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/plugin/dnd_cast.go

@@ -231,8 +231,13 @@ func (p *AdventurePlugin) resolveHealOutOfCombat(ctx MessageContext, c *DnDChara
 	}
 	totalDice := dice + extra
 	heal := 0
+	supreme := lifeDomainSupremeHealing(c)
 	for i := 0; i < totalDice; i++ {
-		heal += 1 + rand.IntN(faces)
+		if supreme {
+			heal += faces
+		} else {
+			heal += 1 + rand.IntN(faces)
+		}
 	}
 	heal += abilityModifier(c.WIS)
 	heal += lifeDomainHealBonus(c, spell, slotLevel)