feat: add first-victory camp exploration

docs/visual-asset-prologue-exploration-report.md

@@ -10,6 +10,7 @@ character artwork is included in the runtime files.
 | --- | --- | --- |
 | Zhuo village and militia camp | `src/assets/images/exploration/prologue-village.webp`, `prologue-militia-camp.webp` | 1920×1080 opaque WebP |
 | Exploration SD characters | `src/assets/images/exploration/characters/exploration-*.webp` | 3072×768 transparent WebP sprite sheets |
+| First-victory camp Jian Yong | `src/assets/images/exploration/characters/exploration-jian-yong.webp` | 3072×768 transparent WebP sprite sheet |
 | Prologue NPC dialogue portraits | `src/assets/images/portraits/zhuo-*-yellow-turban.webp`, `zou-jing-yellow-turban.webp` | 1254×1254 WebP |
 
 The two backgrounds reserve the exact top, right, and bottom HUD regions used
@@ -69,6 +70,20 @@ infantry archetype. The west view is a mirrored side view, and restrained
 idle/walk motion frames were assembled from the turnarounds for consistent
 in-game scale.
 
+The first-victory camp visit adds Jian Yong with the same built-in image
+generation workflow. Its final request was:
+
+> Original 2.5-head SD Jian Yong turnaround for a historical desktop RPG,
+> exactly three equal front, right, and back views. Preserve the identity and
+> practical early-campaign scholar-officer costume from the supplied project
+> portrait, match the project's painterly cel-shaded exploration style, show
+> the complete body and feet, and use a flat magenta removable background. No
+> text, logo, watermark, extra character, or copyrighted likeness.
+
+The generated turnaround was chroma-cleaned and assembled by
+`scripts/build-exploration-character-sheet.py`; only the optimized transparent
+runtime sheet is shipped.
+
 ## Optimization and verification
 
 - Backgrounds are limited to 2 MiB each and 4 MiB combined.