Add Han River flood chapter

docs/roadmap.md

@@ -63,16 +63,17 @@ Build a small complete tactical RPG loop that can grow into a longer Romance of
 - Shu-Han foundation story milestone, where the King of Hanzhong council advances into Liu Bei's formal state-building scene and points the next arc toward Guan Yu's Jing Province defense
 - Thirty-eighth battle Jing Province defense vanguard route, using a twenty-two-officer roster but limiting sortie to seven officers so Guan Yu's front, Ma Liang's local judgment, Mi Zhu's supply role, and Wu/Wei pressure become a deliberate pre-battle choice
 - Thirty-ninth battle Fan Castle outer-front route, locking Liu Bei and Guan Yu as required sortie officers while the player chooses five support officers from the twenty-two-officer roster to pressure Pang De, Cao Ren, and Yu Jin
+- Fortieth battle Han River flood route, using Guan Yu's water-control plan across an 80x62 flooded battlefield to break Yu Jin's seven armies and open the Fan Castle siege setup
 - Camp progress timeline tab that summarizes Liu Bei's long campaign arc, completed battles, current chapter, latest battle, and next major chapter
 - Tactical sortie preparation panel with battle-specific sortie limits, recommended officers with reasons, class role, named equipment, core stats, bond partner, next-map terrain suitability, deployment preview, formation roles, active bond count, recruited-officer count, reserve roster summary, and readiness advice for each deployable officer
 - Officer collection support in camp, including full roster status, selected/reserve/recommended markers, and post-battle reserve training growth for benched officers
 - Treasure equipment effects wired into battle previews and resolution, including named weapon damage bonuses, defensive treasure mitigation, support recovery bonuses, turn-start charm recovery, and equipment-specific growth bonuses
-- Flow verification script from title through the thirty-ninth battle victory, King of Hanzhong council milestone, Shu-Han foundation milestone, recruit sortie selection, Liu Biao visit rewards, Zhuge Liang recruitment, Bowang/Changban/Jiangdong/Red Cliffs/Jing Province/Guiyang/Wuling/Changsha/Yi Province/Fu Pass/Luo Castle/Luofeng/Luo main gate/Mianzhu/Chengdu/Jiameng/Yangping/Dingjun/Hanzhong/Jing defense/Fan Castle camp states, campaign timeline state, and camp save state
+- Flow verification script from title through the fortieth battle victory, King of Hanzhong council milestone, Shu-Han foundation milestone, recruit sortie selection, Liu Biao visit rewards, Zhuge Liang recruitment, Bowang/Changban/Jiangdong/Red Cliffs/Jing Province/Guiyang/Wuling/Changsha/Yi Province/Fu Pass/Luo Castle/Luofeng/Luo main gate/Mianzhu/Chengdu/Jiameng/Yangping/Dingjun/Hanzhong/Jing defense/Fan Castle/Han River camp states, campaign timeline state, and camp save state
 
 ## Next Steps
 
-1. Build the Han River flood and Seven Armies setup, using Guan Yu's northward pressure, Yu Jin's main force, Pang De's resolve, and the water-control plan as the next campaign tension
-2. Expand Fan Castle inter-battle events, including water-level scouting, siege logistics, bond choices, and supply decisions that affect sortie recommendations
+1. Build the Fan Castle siege follow-up, using the aftermath of Yu Jin's defeat, Pang De's resolve, Cao Ren's defense, and Wu's growing shadow as the next campaign tension
+2. Expand Han River aftermath events, including prisoner handling, dike repair, siege logistics, bond choices, and supply decisions that affect sortie recommendations
 3. Expand sortie selection into richer pre-battle officer planning, including explicit reserve drills, class practice, and bond-focused camp assignments
 4. Add a dedicated treasure/equipment management view so players can compare special effects and growth
 5. Keep expanding scenarios through the long campaign instead of treating the current slice as an ending