In cmd_autoinit, when find_first_file fails to open ./bsdl_files/ the
error path printed `filename` — which is only populated inside the
directory-walk loop. Outside that loop it is uninitialized stack
content, leading to garbage in the error message (and a confusing
diagnostic when bs is launched from a directory without a bsdl_files/
subfolder, e.g. build/).
Print `scanfolder` (the actual path that was attempted) instead.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>