The repo linted at 120 (E501, isort) but ran ruff format at 88 via a
--line-length 88 override in the Makefile and CI, leaving the formatter
and the linter disagreeing on wrap width. Drop the override so ruff.toml's
line-length = 120 is the single source of truth and reformat the tree to
match.
* fix(batch_completion): submit all model futures before waiting
* test: add batch_completion all responses concurrency regression
* fix(batch_completion): continue collecting responses on per-model failures
* fix(batch_completion): handle empty and string models in all responses
* test(batch_completion): avoid blocking wait in concurrency regression
