Make the vision judge discover cost-effective OpenRouter models

Add openrouter_judge.py to rank live image+JSON models by advertised price,
with ordered fallbacks, auth-error handling and auto selection. Wire both judges
to --model auto, record the model used, and add fake-catalogue/mocked-call
tests. Re-run the judges with the valid key: 13/13 screen designs match, 0 diff;
the Forward+ A/B report records the selected model and ~$0.006 spend. Headless
231/231, Python 94/94.

PLAN.md

@@ -172,7 +172,7 @@ Primary decisions: [ADR-0007](docs/adr/0007-locomotion-and-input-layers.md), [AD
 
 ## Versioning and Delivery
 
-`config/version` in `project.godot` is the single version source (currently `0.7.1`). Releases are tagged `v<version>`; the CI pipeline builds and publishes the standard artifacts plus the optional Desktop HQ zip. Version bumps follow [Semantic Versioning](https://semver.org/). See [`docs/RELEASING.md`](docs/RELEASING.md) and [`README.md`](README.md) for commands.
+`config/version` in `project.godot` is the single version source (currently `0.7.2`). Releases are tagged `v<version>`; the CI pipeline builds and publishes the standard artifacts plus the optional Desktop HQ zip. Version bumps follow [Semantic Versioning](https://semver.org/). See [`docs/RELEASING.md`](docs/RELEASING.md) and [`README.md`](README.md) for commands.
 
 ## Design Direction