Streams the raw bytes of the named object from the bucket on the
specified branch, including objects inherited from ancestor branches.
Served by the user's session (no customer S3 credentials required).
The body is returned as application/octet-stream so a browser treats
it as a download; the Content-Length and ETag response headers echo
the stored object metadata.
BINARY-STREAM EXCEPTION TO THE BUILD-GENERATED-TYPES RULE (#7029): the
successful 200 body is the raw object stream, proxied verbatim from the
platform storage admin endpoint. It is modeled as an
application/octet-stream binary body (not a JSON response schema) and
is streamed without buffering the whole object in memory. Error
responses still use the generated GeneralError shape.
Note: This endpoint is currently in Private Beta.