Add Ruxu crossing scenario

README.md

@@ -4,7 +4,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 
 ## Current Slice
 
-- Forty-three campaign scenarios.
+- Forty-four campaign scenarios.
 - Grid movement.
 - Unit selection.
 - Move, attack, wait, end turn.
@@ -64,6 +64,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 - Hanzhong Settlement consumes the Hanzhong Gate branch flags and turns the basin toward a Hanzhong garrison or Ruxu pivot.
 - Ruxu Advance consumes the Hanzhong Settlement branch flags and opens Ruxu bank or Sun Quan river-line follow-up choices.
 - Ruxu River Line consumes the Ruxu Advance branch flags and introduces water-move enemy boats along the riverbank.
+- Ruxu Crossing consumes the Ruxu River Line branch flags and turns Ruxu toward an eastern crossing base or Fancheng relief.
 - Post-battle choices can save campaign flags that branch later briefing text, shop stock, and scenario events.
 - Scenario post-battle dialogue can play before the victory result panel.
 - Basic battle EXP, level-ups, and core first-tier class promotion routes.