improve: fix CI branch target (main->master) and fix CONTRIBUTING.md typos

.github/workflows/ci.yml

@@ -2,10 +2,10 @@ name: CI
 
 on:
   push:
-    branches: [main]
+    branches: [master]
     tags: ["v*"]
   pull_request:
-    branches: [main]
+    branches: [master]
 
 permissions:
   contents: read

CONTRIBUTING.md

@@ -8,14 +8,15 @@ Thanks for your interest in contributing!
 2. Create a virtual environment: python -m venv .venv && source .venv/bin/activate
 3. Install dev dependencies: pip install -e ".[dev]"
 4. Run tests: pytest tests/ -v
-5. Lint: uff check src/
+5. Lint: ruff check src/
+6. Run ruff format src/ --check before committing
 
 ## Pull Requests
 
 - Fork the repo and create a feature branch
 - Add tests for any new functionality
 - Ensure all existing tests pass
-- Run uff check src/ --fix before committing
+- Run ruff check src/ --fix before committing
 - Keep PRs focused on a single change
 
 ## Reporting Issues
@@ -32,4 +33,4 @@ Thanks for your interest in contributing!
 
 ## License
 
-By contributing, you agree your work will be licensed under the same license as this project.
+By contributing, you agree your work will be licensed under the same license as this project.