zeta2: Output `bucketed_analysis.md` (#42890)

Closes #ISSUE

Makes it so that a file named `bucketed_analysis.md` is written to the
runs directory after an eval is ran with > 1 repetitions. This file
buckets the predictions made by the model by comparing the edits made so
that seeing how many times different failure modes were encountered
becomes much easier.

Release Notes:

- N/A *or* Added/Fixed/Improved ...
4bf3b9d62eBen Kunkle committed on 11/17/2025, 8:17:39 PM· committed by GitHubparent599a217
1 file changedLine totals unavailable