feat: scaffold avatar pipeline with ComfyUI driver, MLflow logging, and rclone promotion

- setup.sh: automated desktop env setup (ComfyUI, 3D-Pack, UniRig, Blender, Ray)
- ray-join.sh: join Ray cluster as external worker with 3d_gen resource label
- vrm_export.py: headless Blender GLB→VRM conversion script
- generate.py: ComfyUI API driver (submit workflow JSON, poll, download outputs)
- log_mlflow.py: REST-only MLflow experiment tracking (no SDK dependency)
- promote.py: rclone promotion of VRM files to gravenhollow S3
- CLI entry points: avatar-generate, avatar-promote
- workflows/ placeholder for ComfyUI exported workflow JSONs

Implements ADR-0063 (ComfyUI + TRELLIS + UniRig 3D avatar pipeline)

pyproject.toml

@@ -0,0 +1,40 @@
+[project]
+name = "avatar-pipeline"
+version = "0.1.0"
+description = "ComfyUI image-to-VRM avatar generation pipeline with TRELLIS + UniRig"
+requires-python = ">=3.11"
+license = { text = "MIT" }
+authors = [{ name = "Davies Tech Labs" }]
+
+dependencies = [
+    # HTTP client for ComfyUI API + MLflow REST
+    "httpx>=0.27.0",
+
+    # Image handling
+    "Pillow>=10.0.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0.0",
+    "ruff>=0.4.0",
+]
+
+[project.scripts]
+avatar-generate = "avatar_pipeline.generate:main"
+avatar-promote = "avatar_pipeline.promote:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.ruff]
+line-length = 100
+target-version = "py311"
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "UP", "B", "C4", "SIM"]
+ignore = ["E501"]
+
+[tool.ruff.format]
+quote-style = "double"