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_session_build.go

@@ -149,6 +149,8 @@ func applySessionBuffs(player *Combatant, s CombatStatuses) {
 	player.Mods.DamageBonus += s.BuffDamageBonus
 	player.Mods.PetAttackProc += s.BuffPetProc
 	player.Mods.PetAttackDmg += s.BuffPetDmg
+	player.Mods.SpiritWeaponProc += s.BuffSpiritProc
+	player.Mods.SpiritWeaponDmg += s.BuffSpiritDmg
 	if s.BuffDamageReductMul > 0 {
 		player.Mods.DamageReduct *= s.BuffDamageReductMul
 	}