fix(combat): Block run action when cant_charge flag is set

SRD Conditions Fatigued: A fatigued character can neither run nor
charge. _execute_charge already checked cant_charge; _execute_run did
not -- a fatigued/exhausted/entangled combatant could still run.

Added cant_charge guard to _execute_run (mirrors _execute_charge),
logging wait (cannot run) and returning ok. Two engine-level tests:
fatigued cannot run, exhausted cannot run.

src/pf1e_simulator/combat.py

@@ -4097,6 +4097,11 @@ class CombatEngine:
         if self.has_condition_flag(state, "cant_move"):
             self._log(f"round {self._current_round} {state.combatant.id}: wait (cannot move)")
             return ActionResult(kind=kind, ok=True, reason=_REASON_OK)
+        # SRD "Conditions — Fatigued": "A fatigued character can neither run
+        # nor charge" (same for exhausted/entangled via cant_charge).
+        if self.has_condition_flag(state, "cant_charge"):
+            self._log(f"round {self._current_round} {state.combatant.id}: wait (cannot run)")
+            return ActionResult(kind=kind, ok=True, reason=_REASON_OK)
         if action.destination is not None:
             if action.destination == state.pos:
                 path: list[Pos] = []  # already there: a valid zero-length run