🤖 chore: gitignore .ruff_cache dropped by make fmt

[ibetitsmike]

Summary

Ignore .ruff_cache/, which make fmt / make fmt-check drop at the repo root, so workspace archiving stops prompting about lossy untracked files.

Background

fmt.mk runs uvx ruff format benchmarks as part of fmt-python(-check), which is included in make fmt, make fmt-check, and make static-check. Since the repo has no pyproject.toml/ruff.toml, ruff writes its cache to ./.ruff_cache/ (reproduced in a scratch dir).

The archive preflight (worktreeArchiveSnapshotService.listUnsupportedUntrackedFiles) lists untracked paths via git ls-files --others --exclude-standard --directory, so the cache dir triggers the "confirm lossy untracked files" dialog in practically every workspace that ran static checks. workspaceService.test.ts even uses .ruff_cache/ as its example untracked path.

Because the preflight uses --exclude-standard, gitignoring the directory removes it from the prompt immediately, including for existing workspaces. Kept ruff's cache (rather than --no-cache in fmt.mk) for incremental format speed.

Validation

• Created a fake .ruff_cache/ and confirmed git check-ignore matches and git ls-files --others --exclude-standard --directory returns nothing.

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[ibetitsmike]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 879c8dd026

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