Add Jingzhou supply line 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-five-scenario campaign.
+- Next-battle flow exists across the current forty-six-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-five-scenario campaign order exists.
+- Linear forty-six-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.
@@ -105,6 +105,7 @@
 - Forty-third-scenario content exists with Ruxu river-line pressure, water-move enemy boats, Ruxu bank or Sun Quan line branch reactions, and Ruxu camp or crossing follow-up flags.
 - Forty-fourth-scenario content exists with Ruxu crossing pressure, water-move counterboats, camp or forced-crossing branch reactions, and Ruxu base or Fancheng relief follow-up flags.
 - Forty-fifth-scenario content exists with Fancheng relief pressure, protected Fancheng messenger defense, Ruxu crossing or Fancheng relief branch reactions, and Fancheng reinforcement or Jingzhou supply follow-up flags.
+- Forty-sixth-scenario content exists with Jingzhou supply-line pressure, Guan Yu rearguard resistance, Fancheng reinforcement or supply-strike branch reactions, and Fancheng line or rearguard pursuit follow-up flags.
 
 ## Milestone 5: Presentation