fix(combat): channel energy targets living vs undead

tests/test_determinism.py

@@ -35,9 +35,9 @@ def _make_grid() -> Grid:
 
 
 def _make_channel_policy(_engine: CombatEngine, state: CombatantState) -> tuple[Action, ...]:
-    """Emit a channel_energy on an alpha, otherwise the default policy."""
+    """Emit a channel_energy (heal mode) on an alpha, otherwise the default policy."""
     if state.combatant.id == "oni-a":
-        return (Action(kind="channel_energy", target_id="oni-b"),)
+        return (Action(kind="channel_energy", target_id="oni-b", channel_mode="heal"),)
     return default_policy(_engine, state)