feat(character): ComfyUI blueprints and a render-vs-blueprint evaluation

Two tools that turn character work into something measurable.

- Tools/comfyui_character_blueprint.py generates a four-view sheet (front, side, back,
  head) plus a contact sheet from one description, with fixed seeds and a JSON record
  of prompts and prompt ids. First sheet: 'GigLine walker', lean pedestrian in a navy
  tee, jeans and sneakers.
- Tools/character_match.py compares a rendered character against a sheet: figure
  aspect, fill and coverage deltas, mean CIE76 colour distance, dominant-palette
  distance, and a side-by-side montage. The deltas stay separate on purpose - a single
  similarity score between a photoreal sheet and a low-detail body would be a number
  with no meaning.
- comfyui_generate.py grew wait_for_image() so both tools share the polling path
  instead of duplicating it.
- 13 unit tests for the colour maths, masks and palette; 95 tool tests pass.

First real result, recorded rather than smoothed over: aspect delta 1.24, fill delta
0.12, mean deltaE 31.9, palette deltaE 25.4. The montage shows the reason - the model
is a nude body and the blueprint wears a tee and jeans, so clothing dominates every
metric. Figure segmentation is explicit (--render-box): auto-detection picked backdrop
blobs on every attempt, and a background plate is the proper fix.

Tools/README.md

@@ -90,6 +90,10 @@ Geographic tools live in [`Geo/tools/`](../Geo/README.md) and the Blender-side b
 | --- | --- |
 | `input_emulation.py` | Pure-stdlib `ctypes`/`fcntl` driver that creates a virtual keyboard+mouse on `/dev/uinput`. The desktop treats it as real hardware, so it proves whether OS input actually reaches the game. Needs `/dev/uinput` writable (ACL on this host). |
 | `input_test.py` | Injects a scripted sequence into the focused window: `--sequence move:2,look:3,jump:1,reset:1,pause:1,click`. |
+| `comfyui_generate.py` | Local ComfyUI driver: list checkpoints, run txt2img through the HTTP API, and write a provenance sidecar (model, prompt, seed, full graph). Local, human-triggered. | `models`; `txt2img --prompt ... --out <png>` | `python3 Tools/comfyui_generate.py models` |
+| `comfyui_character_blueprint.py` | Generates a character blueprint sheet - front, side, back and head views plus a contact sheet - from one description, with fixed seeds and a JSON record. | `--desc`, `--out`, `--model`, `--size` | `python3 Tools/comfyui_character_blueprint.py --desc "lean pedestrian, navy tee, jeans" --out Art/characters/blueprints` |
+| `character_match.py` | Compares a rendered character against a blueprint: figure aspect, fill and coverage deltas, mean CIE76 colour distance, dominant-palette distance, and a side-by-side montage. | `--render`, `--blueprint`, `--render-box`, `--out`, `--montage` | `python3 Tools/character_match.py --render Screenshots/demo/review-demo-third-person-front.png --blueprint Art/characters/blueprints/front.png --render-box 0.42,0.46,0.56,0.97 --montage /tmp/gigline/match.png` |
+| `generate_character_textures.py` | Procedural skin-pore and hair-strand textures with sidecars; no model involved. | `--out` | `python3 Tools/generate_character_textures.py --out Art/textures/generated` |
 
 ## Tests