docs: Add learnings about tool usage

CLAUDE.md

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+# Tool Usage Learnings
+
+This file is intended to be used by an LLM such as Claude.
+
+## UV Package Manager
+
+- Use `uv run` to run Python tools without activating virtual environments
+- For formatting: `uv run ruff format .`
+- For type checking: `uv run pyright`
+- For upgrading packages:
+  - `uv add --dev package --upgrade-package package` to upgrade a specific package
+  - Don't use `@latest` syntax - it doesn't work
+  - Be careful with `uv pip install` as it may downgrade packages
+
+## Git and GitHub CLI
+
+- When using gh CLI for PRs, always quote title and body:
+  ```bash
+  gh pr create --title "\"my title\"" --body "\"my body\""
+  ```
+- For git commits, use double quotes and escape inner quotes:
+  ```bash
+  git commit -am "\"fix: my commit message\""
+  ```
+
+## Python Tools
+
+### Ruff
+- Handles both formatting and linting
+- For formatting: `uv run ruff format .`
+- For checking: `uv run ruff check .`
+- Common issues:
+  - Line length (default 88 chars)
+  - Import sorting
+  - Unused imports
+
+### Pyright
+- Type checker
+- Run with: `uv run pyright`
+- Version warnings can be ignored if type checking passes
+- Common issues:
+  - Optional types need explicit None checks
+  - String operations need type narrowing
+
+## Best Practices
+
+1. Always check git status and diff before committing
+2. Run formatters before type checkers
+3. When fixing CI:
+   - Start with formatting issues
+   - Then fix type errors
+   - Then address any remaining linting issues
+4. For type errors:
+   - Get full context around error lines
+   - Consider optional types
+   - Add type narrowing checks when needed