Improve character cutout prompts and offline candidate evaluation

references/highres-characters/tiddybub-toon/README.md

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+# Kenney Toon Characters (single-pose references)
+
+These six transparent PNG references are cropped from the Kenney Toon Characters
+vector sheets and rendered at 768x1024. They are suitable as single-character
+inputs for the Spine decomposition pipeline.
+
+- `crops-768/character_femaleAdventurer-single.png`
+- `crops-768/character_maleAdventurer-single.png`
+- `crops-768/character_robot-single.png`
+- `crops-768/character_zombie-single.png`
+- `crops-768/character_femalePerson-single.png`
+- `crops-768/character_malePerson-single.png`
+
+Source: [Kenney Toon Characters](https://kenney.nl/assets/toon-characters)
+
+License: CC0 1.0 (public domain dedication). The provenance mirror's
+`SOURCE.md` is available at
+<https://github.com/Tiddybub/2d-assets/tree/main/characters/toon-characters>.