Wrap dask_setup scripts in if __name__ == "__main__" guard; use threaded scheduler for import scripts

[Copilot]

When using dask.distributed, worker processes are forked and re-import the script, causing top-level code to execute unintentionally. All scripts using get_dask_client must gate execution behind if __name__ == "__main__":.

Changes

• All 14 dask_setup scripts — moved all code (including any pre-with get_dask_client(...) setup that accesses snakemake) inside if __name__ == "__main__":

• 3 scripts hardcoded to "threads" scheduler — ome_zarr_to_nii.py, create_imaris_crops.py, create_patches.py now bypass snakemake.config["dask_scheduler"] and always use the threaded scheduler:

# Before
with get_dask_client(snakemake.config["dask_scheduler"], snakemake.threads):
    ...

# After
if __name__ == "__main__":
    with get_dask_client("threads", snakemake.threads):
        ...

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