torch/pandas/pyarrow/polars/uproot/awkward/particle were all imported
at module scope in giant/cli.py and giant/tools/dwarf.py, so even
`--help` paid ~1.6-1.9s of import cost. Move those imports into the
command bodies that actually need them (following the deferred-import
pattern already used for analysis/render/plots/sklearn/wandb), cutting
`giant --help` to ~0.3s and `dwarf --help` to ~0.2s with no change to
any command's actual behavior.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
lars