Spiritual Weapon: own channel + narration; rest blocked mid-zone

Spiritual Weapon used to ride the pet-attack channel, so a petless
cleric saw "🐾 Your faithful companion" each round and couldn't tell
the spell was firing. Split it to SpiritWeaponProc/Dmg with its own
✨ flavor; damage now scales with spell mod + upcast.

Rest also fired mid-dungeon — only the autorun honored RestingUntil,
the !rest commands themselves had no gate. Block both short and long
rest when an expedition or combat session is active.

internal/plugin/combat_turn_engine.go

@@ -219,6 +219,10 @@ func (te *turnEngine) stepPlayerTurn(action PlayerAction) {
 		te.finish(CombatStatusWon)
 		return
 	}
+	if te.spiritWeaponStrike() {
+		te.finish(CombatStatusWon)
+		return
+	}
 	te.sess.Phase = CombatPhaseEnemyTurn
 }
 
@@ -244,6 +248,24 @@ func (te *turnEngine) petStrike() bool {
 	return enemyDown(st, turnCombatPhase.Name)
 }
 
+// spiritWeaponStrike resolves the spell's bonus-action attack each round when
+// the spiritual_weapon buff is active. Same per-turn cadence as petStrike, but
+// rolls and narrates on its own channel so the spectral mace doesn't borrow
+// pet flavor on a petless caster. Returns true if the strike dropped the enemy.
+func (te *turnEngine) spiritWeaponStrike() bool {
+	st := te.st
+	if te.player.Mods.SpiritWeaponProc <= 0 || st.randFloat() >= te.player.Mods.SpiritWeaponProc {
+		return false
+	}
+	dmg := te.player.Mods.SpiritWeaponDmg + st.roll(5)
+	st.enemyHP = max(0, st.enemyHP-dmg)
+	st.events = append(st.events, CombatEvent{
+		Round: st.round, Phase: turnCombatPhase.Name, Actor: "spirit_weapon", Action: "spirit_weapon_strike",
+		Damage: dmg, PlayerHP: st.playerHP, EnemyHP: st.enemyHP,
+	})
+	return enemyDown(st, turnCombatPhase.Name)
+}
+
 // stepPlayerActionEffect resolves a !cast / !consume turn: the command handler
 // has already rolled the spell / picked the item and spent the resource, so the
 // engine only applies the HP deltas and emits the event before handing off to
@@ -295,6 +317,10 @@ func (te *turnEngine) stepPlayerActionEffect(eff *turnActionEffect) {
 		te.finish(CombatStatusWon)
 		return
 	}
+	if te.spiritWeaponStrike() {
+		te.finish(CombatStatusWon)
+		return
+	}
 	if eff.EnemySkip {
 		// fear_immune enemies shrug off control spells — the skip never arms.
 		if enemyImmuneToControl(te.enemy, st) {