Add equipment growth system

docs/roadmap.md

@@ -16,15 +16,16 @@ Build a small complete tactical RPG loop:
 - Cinematic title scene with an original Taoyuan Oath background, subtle motion, menu UI, and first-input audio
 - Cinematic prologue pages with high-resolution story backgrounds, character portraits, non-black scene transitions, and scenario data
 - File-based original soft stereo orchestral BGM loops for title, prologue, oath, militia, and battle-prep scenes
-- First battle scene with a high-resolution battlefield background, large 12x12 tactical grid, high-detail pixel-style unit sprites, class and terrain affinity rules, ally/enemy roster tabs, unit detail stat panels, terrain-cost movement range preview, click-to-move unit movement, cursor-adjacent post-move command popup, right-click move cancel, right-click tactical menu, turn ending/reset, resonance bond tracking, and grayscale acted-unit feedback
+- First battle scene with a high-resolution battlefield background, large 12x12 tactical grid, high-detail pixel-style unit sprites, class and terrain affinity rules, ally/enemy roster tabs, unit detail stat panels, weapon/armor/accessory equipment growth, terrain-cost movement range preview, click-to-move unit movement, cursor-adjacent post-move command popup, right-click move cancel, right-click tactical menu, turn ending/reset, resonance bond tracking, and grayscale acted-unit feedback
 - Flow verification script from title to first battle
 
 ## Next Steps
 
 1. Implement attack range, damage, defeat, victory checks, and real resonance assist attacks
-2. Add strategy and item inventories with usable battle effects
-3. Add a simple enemy AI turn
-4. Add battle result scene and local save/load
+2. Apply treasure equipment effects to damage, defense, recovery, and command rules
+3. Add strategy and item inventories with usable battle effects
+4. Add a simple enemy AI turn
+5. Add battle result scene and local save/load
 
 ## Content Direction