Add Jingzhou supply line scenario

docs/DATA_MODEL.md

@@ -56,6 +56,7 @@ data/scenarios/042_ruxu_advance.json
 data/scenarios/043_ruxu_river_line.json
 data/scenarios/044_ruxu_crossing.json
 data/scenarios/045_fancheng_relief.json
+data/scenarios/046_jingzhou_supply_line.json
 ```
 
 ## Campaign
@@ -113,7 +114,8 @@ The campaign file defines scenario order, resource paths, and officers who are a
     { "id": "042_ruxu_advance", "title": "Ruxu Advance", "path": "res://data/scenarios/042_ruxu_advance.json" },
     { "id": "043_ruxu_river_line", "title": "Ruxu River Line", "path": "res://data/scenarios/043_ruxu_river_line.json" },
     { "id": "044_ruxu_crossing", "title": "Ruxu Crossing", "path": "res://data/scenarios/044_ruxu_crossing.json" },
-    { "id": "045_fancheng_relief", "title": "Fancheng Relief", "path": "res://data/scenarios/045_fancheng_relief.json" }
+    { "id": "045_fancheng_relief", "title": "Fancheng Relief", "path": "res://data/scenarios/045_fancheng_relief.json" },
+    { "id": "046_jingzhou_supply_line", "title": "Jingzhou Supply Line", "path": "res://data/scenarios/046_jingzhou_supply_line.json" }
   ]
 }
 ```

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