Add Wu counterstroke 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 fifty-three-scenario campaign.
+- Next-battle flow exists across the current fifty-four-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 fifty-three-scenario campaign order exists.
+- Linear fifty-four-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.
@@ -113,6 +113,7 @@
 - Fifty-first-scenario content exists with eastern-front alarm pressure, water-move Wu boats, Wei authority or prepared-front branch reactions, and eastern fleet or Wu river-line follow-up flags.
 - Fifty-second-scenario content exists with Wu river-line pressure, water-move counterboats, eastern fleet or river-line pressure branch reactions, and Ruxu fleet or Jianye pressure follow-up flags.
 - Fifty-third-scenario content exists with Jianye approach pressure, water-move counterboats, Ruxu fleet or Jianye-pressure branch reactions, and secured approach or Wu counterstroke follow-up flags.
+- Fifty-fourth-scenario content exists with Wu counterstroke pressure, water-move counterboats, secured approach or forced-counterstroke branch reactions, and lower Yangtze route or Jianye gate follow-up flags.
 
 ## Milestone 5: Presentation