move ruff cache into .config folder

[ejfine]

get more things out of repo root

it was gitignored, but in development, you still could see that folder at repo root (if IDE settings not automatically set to exclude it)

tested in this repo only

Summary by CodeRabbit

• Chores
  • Updated linting configuration to store its cache in a consistent project-local location.
  • No user-facing functionality was changed.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: fe8f155e-bb38-47b4-b610-42fa0e75f924

📥 Commits

Reviewing files that changed from the base of the PR and between 0b63e35 and 6b401ea.

📒 Files selected for processing (1)

• .config/pyrefly.toml

📝 Walkthrough

Walkthrough

Ruff’s cache directory is explicitly configured as .config/.ruff_cache, resolved relative to the repository root when pre-commit runs.

Changes

Ruff cache configuration

Layer / File(s)	Summary
Configure Ruff cache location .config/ruff.toml	Adds cache-dir = ".config/.ruff_cache" with a comment describing repository-root resolution under pre-commit.

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

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is missing the required template sections and only provides brief notes.	Add the required headings for issue link, why, how, side effects, testing, and other, and expand each section.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: relocating the Ruff cache under .config.

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