"""The MergeBench arm: the Beetle mergeability metric suite, computed over MergeBench's 40 checkpoints.

`suite`  enumerates the HF org (never a hand-written list) and forms the mergeable pairs.
`sweep`  computes the F8 property panel per pair, one base family at a time, streamed.
`panel`  joins those properties to MergeBench's OWN published merge scores and draws the figures.

Read `RESULTS_MERGEBENCH.md` at the repo root first: the outcome column here is NOT ours. We do not
re-evaluate merged models; we reuse the numbers MergeBench published, and those numbers cover a
different population (5-expert merges, one per base family) than the pairwise properties we measure.
That mismatch is the headline limitation and it is recorded, not worked around.
"""