Keep ruff out of the .claude worktrees

[gouwens]

Follow-up to #37. Running uv run --frozen ruff check from the repository root reports 181 errors — every one of them inside .claude/worktrees/, and none in the project itself.

Cause

Claude Code keeps its git worktrees under .claude/worktrees/, each a full copy of this repo at whatever commit it was cut from. Nine of them exist locally, and the ones predating #37 still contain the entire pre-format tree. Ruff was walking into all of them and reporting on a checkout that is not this checkout.

Nothing under .claude is gitignored — it is merely untracked — so ruff's usual .gitignore filtering never applied.

Why #37 did not catch it

Neither place the linter had run can see that directory:

• the lint CI job runs against a fresh clone, which has no .claude/worktrees;
• the adoption work itself was done from inside one of those worktrees, where the path does not exist either.

Only a run from the main checkout's root reaches it — which is exactly how it was found.

Fix

extend-exclude = [".claude/worktrees"]

Scoped to worktrees rather than all of .claude so a future .claude/*.py of our own stays in scope. The setting is inert in CI, where the directory is absent.

Verification

Run from the main checkout root, where the failure actually reproduced:

	before	after
ruff check	181 errors	clean
ruff format --check	—	39 files already formatted

On the branch itself: ruff check clean, 38 files formatted, 366 passed / 36 skipped.

🤖 Generated with Claude Code