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>

__init__.py

@@ -0,0 +1,15 @@
+"""ComfyUI-Prompt-Calibratror — VLM-as-judge prompt calibration loop."""
+
+from .nodes.qwen_judge import (
+    NODE_CLASS_MAPPINGS as _JUDGE_CLASSES,
+    NODE_DISPLAY_NAME_MAPPINGS as _JUDGE_NAMES,
+)
+from .nodes.receptor import (
+    NODE_CLASS_MAPPINGS as _RECEPTOR_CLASSES,
+    NODE_DISPLAY_NAME_MAPPINGS as _RECEPTOR_NAMES,
+)
+
+NODE_CLASS_MAPPINGS = {**_JUDGE_CLASSES, **_RECEPTOR_CLASSES}
+NODE_DISPLAY_NAME_MAPPINGS = {**_JUDGE_NAMES, **_RECEPTOR_NAMES}
+
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS"]