* chore(lint): remove dead E501 config, fix stale blame-ignore SHAs, note 120 width in CLAUDE.md
E501 sat in both lint.ignore and lint.extend-select in ruff.toml; ignore wins,
so no line length was linted at all (verified: a 130-char line passes ruff
check while T201 fires). Remove it from both lists so the config tells the
truth: the formatter's wrap width is the only line-length control, matching
how the repo has actually behaved since E501 was ignored in Oct 2024
.git-blame-ignore-revs listed the pre-squash PR-head SHAs for the two ruff
reformat commits (#31317, #31518), which never landed on the branch, so git
blame ignored nothing. Replace them with the squash-merge SHAs that are
actually in history
Also document in CLAUDE.md that the line length is 120 (ruff.toml), not 88,
so agents stop wrapping to the old Black width
* fix: make CLAUDE.md more concise
* fix: make the guideline more clear
Both #31317 (black to ruff format) and #31518 (unify width on 120) are
mechanical reformats with AST-equivalence proofs, so add them to
.git-blame-ignore-revs to keep blame pointing at the real authors.
Add the squash-merged SHA of #29622 (style(ui): run prettier --write
across the dashboard) to .git-blame-ignore-revs so the bulk reformat
stops masking the real authors of those lines in git blame and the
GitHub blame UI
because I made a lot of fairly mindless changes to pydantic code to fix warnings
and I don't want git blame to give people the impression that I know more about
this code than I do.
