Add Xinye 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 twenty-four-scenario campaign.
+- Next-battle flow exists across the current twenty-five-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 twenty-four-scenario campaign order exists.
+- Linear twenty-five-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.
@@ -84,6 +84,7 @@
 - Twenty-second-scenario content exists with Liaoxi pursuit, Yuan envoys, Wuhuan outriders, and 021 branch reactions.
 - Twenty-third-scenario content exists with White Wolf Mountain, Wuhuan riders, Yuan exile escorts, and 022 branch reactions.
 - Twenty-fourth-scenario content exists with Liaodong pursuit, Yuan fugitives, Liaodong border guards, and 023 branch reactions.
+- Twenty-fifth-scenario content exists with Xinye advance, Liu Bei's rearguard, Jing Province pressure, and 024 branch reactions.
 
 ## Milestone 5: Presentation