ruff workflow

docs/usage.md

@@ -260,6 +260,17 @@ Use this checklist when configuring GitHub Copilot in VS Code against `personal-
 6. verify context size remains bounded
 7. validate behavior in Ask/Edit/Agent-style workflows with at least one task each
 
+## Local Ruff Workflow
+
+Use [Ruff](https://docs.astral.sh/ruff/) locally through `uv` so lint and format checks are consistent for contributors.
+
+1. Lint check: `uv run ruff check .`
+2. Apply safe lint fixes: `uv run ruff check . --fix`
+3. Format files: `uv run ruff format .`
+4. Format check (CI-style): `uv run ruff format --check .`
+
+Rule-family baseline for this repository is `E`, `F`, `I`, and `UP`, configured in [pyproject.toml](../pyproject.toml).
+
 Suggested instruction policy text:
 
 1. Start with catalog-first discovery.