Cross-reference ruff/black/isort version pins between the two files

[hjmjohnson]

ruff, black and isort are each pinned twice: once in pyproject.toml's testing extra (the range a developer installs from) and once in .pre-commit-config.yaml (the exact rev pre-commit builds its environment from). Only black and isort carried a one-sided "keep synced" comment, in .pre-commit-config.yaml only; ruff had none anywhere. A contributor editing one pin had no in-file pointer to the other.

Adds a same-line comment at each of the six pin sites naming the file holding its counterpart. No version or behavior change — verified pyproject.toml still parses as TOML and .pre-commit-config.yaml still parses as YAML, and pre-commit run --all-files passes with the tree unmodified.

Independent of #9089 / #9090 — different lines, no overlap; can land in any order.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Team

Run ID: c012795a-956e-4798-8ba5-01150ae4ec4a

📥 Commits

Reviewing files that changed from the base of the PR and between 9ea04d4 and 32644ef.

📒 Files selected for processing (2)

• .pre-commit-config.yaml
• pyproject.toml

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📝 Walkthrough

Walkthrough

Updated comments in .pre-commit-config.yaml and pyproject.toml to document synchronization for Ruff, Black, and isort versions. Dependency versions and pre-commit hook behavior remain unchanged.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 6eee6

This update improves discoverability between duplicated formatter and linter version pins without changing dependencies or pre-commit behavior. No merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: cross-referencing the Ruff, Black, and isort version pins in both files.
Description check	✅ Passed	The description clearly explains the change, scope, testing, and lack of behavior changes. It omits the template headings, issue reference, and change-type checklist, but the required context is mostl…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description clearly explains the change, scope, testing, and lack of behavior changes. It omits the template headings, issue reference, and change-type checklist, but the required context is mostly complete.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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