Add Ruxu advance scenario

docs/ROADMAP.md

@@ -21,7 +21,7 @@
 - Destination victory conditions and objective map markers exist.
 - Turn-limit conditions and HUD turn-limit display exist.
 - Victory reward summary is visible.
-- Next-battle flow exists across the current forty-one-scenario campaign.
+- Next-battle flow exists across the current forty-two-scenario campaign.
 - Campaign completion and new-campaign reset exist.
 - Reward inventory can be brought into the next battle.
 
@@ -52,7 +52,7 @@
 - Party roster persistence has a first save-file skeleton.
 - Level, experience, and equipment persistence.
 - Chapter selection and save/load.
-- Linear forty-one-scenario campaign order exists.
+- Linear forty-two-scenario campaign order exists.
 - Save reset exists.
 - Victory rewards, consumable counts, equipment stock, and equipped gear persist.
 - A basic pre-battle shop with scenario-specific stock exists. Sell-back and richer item management are still planned.
@@ -101,6 +101,7 @@
 - Thirty-ninth-scenario content exists with Hanzhong approach pressure, Zhang Lu's border guard, mountain-gate stakes, and 038 branch reactions.
 - Fortieth-scenario content exists with Hanzhong gate pressure, Zhang Lu's mountain guard, pass-road siege stakes, 039 branch reactions, and submission or pacification follow-up flags.
 - Forty-first-scenario content exists with Hanzhong basin settlement, storehouse pressure, Zhang Lu submission or pacification branch reactions, and Hanzhong garrison or Ruxu pivot follow-up flags.
+- Forty-second-scenario content exists with Ruxu riverbank pressure, Wu vanguard resistance, Hanzhong garrison or Ruxu pivot branch reactions, and Ruxu bank or Sun Quan river-line follow-up flags.
 
 ## Milestone 5: Presentation