Added helpers for discovering open NeMO portal metadata, including
species, platforms, modalities, assays, brain regions, file formats,
data types, access types, studies, and labs.
Added file search and manifest workflows for planning reproducible
downloads from the NeMO Data Portal and Assets API.
Added guarded download helpers that write manifest files with local
paths, download status, checksums, query parameters, and retrieval
metadata.
Added first-pass loading helpers for compatible downloaded H5AD and
10x HDF5 files into SingleCellExperiment and optional Seurat
workflows.
Added package vignettes for exploration, manifest planning, download
testing, and loading.