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]

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Reviewing files that changed from the base of the PR and between 32644ef and 6b17cd0.

📒 Files selected for processing (1)

• pyproject.toml

🚧 Files skipped from review as they are similar to previous changes (1)

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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 6b17c

This update only documents matching formatter and linter version pins without changing versions or hook behavior. No merge-readiness risk is identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: cross-referencing Ruff, Black, and isort version pins between the two files.
Description check	✅ Passed	The description explains the changes, confirms that behavior and versions are unchanged, records validation results, and provides relevant context. It does not use the repository template headings or …
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.

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