Initial commit: VLM-as-judge prompt calibration loop

Qwen3-VL image-similarity judge node, external-prompt receptor node,
agent_bridge CLI, example SDXL workflow, and methodology/agent-loop/
calibration-policy docs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

requirements.txt

@@ -0,0 +1,10 @@
+# Qwen3-VL needs transformers >= 4.57 (the version the local checkpoint was saved with).
+transformers>=4.57.0
+huggingface_hub   # auto-download of models by repo id / alias
+torch
+pillow
+numpy
+# for precision=nf4 (4-bit) — needed to run the 30B-A3B abliterated judge on 32 GB:
+bitsandbytes
+# optional, for faster attention on the RTX 5090:
+# flash-attn