Add Jingzhou supply line scenario

README.md

@@ -4,7 +4,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 
 ## Current Slice
 
-- Forty-five campaign scenarios.
+- Forty-six campaign scenarios.
 - Grid movement.
 - Unit selection.
 - Move, attack, wait, end turn.
@@ -66,6 +66,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 - 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.
 - Fancheng Relief consumes the Ruxu Crossing branch flags and uses a protected Fancheng messenger defense objective.
+- Jingzhou Supply Line consumes the Fancheng Relief branch flags and cuts Guan Yu's supply road after the siege break.
 - 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.