Motivation

• Ensure dataset ordering handles nested config groups and avoids double-counting Z offsets when upstream prep already produced global Z coordinates.
• Prevent incorrect stacking where a later group's offsets were blindly shifted by a previous group's length, causing duplicated Z displacement.

Description

• Accept nested config_paths groups and collect datasets per group before computing offsets so groups can be treated atomically.
• Compute group_offsets, group_z_start, and group_z_end arrays and detect whether a group already carries global Z offsets; preserve them when they overlap the current global cursor, otherwise shift the group's Z offsets by previous_offset.
• Append dataset stores in group order, skip empty groups, and compute previous_offset as the maximal adjusted Z end across the group to correctly position subsequent groups.
• Convert offsets to mutable lists and add informational logging about preserved global offsets.

Testing

• Ran the project unit test suite with pytest and the tests completed successfully.

Codex Task