Background loads now send local_files_only and the load route rewrites a
cached repo id to its locally resolved snapshot directory before the
weight load, keeping the registry identity intact. A cache populated
outside Studio passes the partial check while missing shards because a
missing download manifest reads as non-partial, and from_pretrained on a
repo id would download the gaps; resolution never touches the network
and an uncached repo returns 409, so incomplete caches fail over to the
next candidate instead of fetching on Send. The platform probe behind
the picker's format gates joins the bounded best-effort prefetch (its
raw fetch has no timeout), falling back to the boot-detected platform
past the grace. The name-based big-endian marker now applies only to
direct .gguf files: a directory named foo-be says nothing about the
files inside it, which the per-file variant filter already covers.
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