Add facial diversity gate for character assets

assets/characters/README.md

@@ -8,9 +8,13 @@ Base standing images should feel like high-end promotional portraits for a matur
 
 ## Current Files
 
-- `han_seoyun_v1.png`: current preferred semi-realistic style target.
-- `yu_harin_v1.png`: accepted semi-realistic base image.
-- `kang_mirae_v1.png`: accepted semi-realistic base image.
+- `han_seoyun_v1.png`: semi-realistic style/composition candidate; needs facial diversity revision.
+- `yu_harin_v1.png`: semi-realistic base candidate; needs facial diversity revision.
+- `kang_mirae_v2.png`: accepted semi-realistic base image with revised facial identity.
+- `kang_mirae_v1.png`: earlier semi-realistic base candidate; same-face risk remains.
+- `jung_naeun_v1.png`: semi-realistic base candidate; needs facial diversity revision.
+- `oh_sera_v1.png`: semi-realistic base candidate; needs facial diversity revision.
+- `park_minseo_v1.png`: semi-realistic base candidate; needs facial diversity revision.
 - `style_references/semirealistic_main_reference.png`: user-approved reference for the target look.
 - `style_tests/han_seoyun_photoreal_test.png`: pure photoreal comparison candidate.
 - `style_tests/kang_mirae_photoreal_test.png`: pure photoreal comparison candidate.
@@ -23,3 +27,11 @@ Base standing images should feel like high-end promotional portraits for a matur
 - Use `<character_id>_v<number>.png` for main candidates.
 - Use `style_tests/<character_id>_<style>_test.png` for experiments.
 - Keep generated originals in their default generator folder; copy selected candidates into this project.
+
+## Validation
+
+```bash
+python3 scripts/validate_assets.py
+```
+
+`accepted` should be used only after the image passes both route-fit and facial-diversity review. Use `needs_revision` for useful style/composition candidates that still look too similar to other cast members.