Add Hanzhong approach scenario

README.md

@@ -4,7 +4,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 
 ## Current Slice
 
-- Thirty-eight campaign scenarios.
+- Thirty-nine campaign scenarios.
 - Grid movement.
 - Unit selection.
 - Move, attack, wait, end turn.
@@ -59,6 +59,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 - Weishui Crossing consumes the Weishui Camps branch flags and turns the western campaign from river defense into a Guanzhong foothold.
 - Guanzhong Foothold consumes the Weishui Crossing branch flags and turns the seized riverbank into a western base against Ma Chao's rearguard.
 - Ma Chao Retreat consumes the Guanzhong Foothold branch flags and drives the western campaign toward Guanzhong pacification or the Hanzhong front.
+- Hanzhong Approach consumes the Ma Chao Retreat branch flags and opens Zhang Lu's mountain gate campaign.
 - 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.