v0.1.7 — standalone load_pipeline fix

Fix: Standalone install actually works now

v0.1.6 shipped to the Comfy Registry but failed at first run with a misleading
Repository Not Found for url: https://huggingface.co/ckpts/... 404. v0.1.7
fixes the real root cause (three layers deep) and adds standalone-mode install support.

Root cause analysis

1. comfy-aimdo's mmgp lib (shipped in ComfyUI Desktop's .venv)
   monkey-patches safetensors.torch.load_file with a memory-mapped reader.
   Its dtype map at mmgp/safetensors2.py:33 omits complex dtypes; one
   Pixal3D decoder checkpoint contains a single C64 (complex64) tensor →
   KeyError: 'C64' blows up the load.
2. Upstream Pixal3D's pipelines/base.py:43-46 has a bare except Exception
   that silently swallows that KeyError and retries with the relative path.
3. The retry path in models/__init__.py:60 misparses relative paths like
   "ckpts/ss_flow_..." as Hugging Face repo IDs and emits the bogus 404 we see.

Fixes (nodes/pixal3d_stages.py)

• snapshot_download(model_path) resolves to an absolute local snapshot dir
  before from_pretrained, so the loader's os.path.exists check (relative
  to CWD) always succeeds.
• Pre-extend mmgp.safetensors2._map_to_dtype with C64/C128 so the mmap
  reader handles complex tensors.
• Wrap from_pretrained in torch.inference_mode(False) as belt-and-suspenders
  against load_state_dict version-counter errors on freshly-constructed
  nn.Module parameters under ComfyUI's outer inference_mode.

Fixes (install.py)

• Standalone-mode fallback: if no pozzettiandrea/ComfyUI-TRELLIS2
  sibling exists, install deps into sys.executable instead of hard-failing.
  This matches how Comfy Registry / Manager invoke install.py with the
  .venv's python — fresh Registry installs now work out of the box.
• Worker python search prefers C:\ce\_env_* (the real comfy-env worker
  pool) over any in-plugin stub Scripts/python.exe.
• install_requirements splits requirements.txt into VCS / hashed / plain
  buckets so pip's --require-hashes mode doesn't reject the VCS MoGe entry.
• Error message: visualbruno → pozzettiandrea (correct upstream fork).

Verified

End-to-end on ComfyUI Desktop + RTX 5090: 56.5s warm run with 8/8/8 steps +
1024 texture + low_vram=True → 8.6 MB GLB output.

Full Changelog: v0.1.6...v0.1.7