Fix KeyError in pipelines.from_pretrained when it is the first touch of the module

[xocialize]

Repro

from trellis2 import pipelines
pipelines.from_pretrained("microsoft/TRELLIS.2-image-to-3D-4B")
# KeyError: 'Trellis2ImageTo3DPipeline'

Fails whenever from_pretrained is the first touch of the module. trellis2/pipelines/__init__.py uses a lazy __getattr__ that populates globals() on first attribute access, but from_pretrained looks the class up with globals()[config['name']] — which bypasses __getattr__ entirely. It only works if something else (e.g. an earlier pipelines.Trellis2ImageTo3DPipeline reference) already triggered the lazy import.

Fix

Route the lookup through the module's own lazy loader:

return getattr(sys.modules[__name__], config['name']).from_pretrained(path)

getattr on the module object hits __getattr__, triggering the intended lazy import. No behavior change when the class is already loaded.

🤖 Generated with Claude Code

[xocialize]

Closing in favor of #175, which has folded this fix in (from_pretrained now routes the class lookup through getattr(sys.modules[__name__], config['name']) instead of globals()[...], so the lazy __getattr__ fires on first module touch). No reason to carry a duplicate that would only conflict at merge — tracking it there instead. Thanks!