Cleanup agent documentation.

AGENTS.md

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+# Agent Guidelines for Leggen
+
+## Build/Lint/Test Commands
+
+### Frontend (React/TypeScript)
+- **Dev server**: `cd frontend && npm run dev`
+- **Build**: `cd frontend && npm run build`
+- **Lint**: `cd frontend && npm run lint`
+
+### Backend (Python)
+- **Lint**: `uv run ruff check .`
+- **Format**: `uv run ruff format .`
+- **Type check**: `uv run mypy leggen leggend --check-untyped-defs`
+- **All checks**: `uv run pre-commit run --all-files`
+- **Run all tests**: `uv run pytest`
+- **Run single test**: `uv run pytest tests/unit/test_api_accounts.py::TestAccountsAPI::test_get_all_accounts_success -v`
+- **Run tests by marker**: `uv run pytest -m "api"` or `uv run pytest -m "unit"`
+
+## Code Style Guidelines
+
+### Python
+- **Imports**: Standard library → Third-party → Local (blank lines between groups)
+- **Naming**: snake_case for variables/functions, PascalCase for classes
+- **Types**: Use type hints for all function parameters and return values
+- **Error handling**: Use specific exceptions, loguru for logging
+- **Path handling**: Use `pathlib.Path` instead of `os.path`
+- **CLI**: Use Click framework with proper option decorators
+
+### TypeScript/React
+- **Imports**: React hooks first, then third-party, then local components/types
+- **Naming**: PascalCase for components, camelCase for variables/functions
+- **Types**: Use `import type` for type-only imports, define interfaces/types
+- **Styling**: Tailwind CSS with `clsx` utility for conditional classes
+- **Icons**: lucide-react with consistent naming
+- **Data fetching**: @tanstack/react-query with proper error handling
+- **Components**: Functional components with hooks, proper TypeScript typing
+
+### General
+- **Formatting**: ruff for Python, ESLint for TypeScript
+- **Commits**: Use conventional commits, run pre-commit hooks before pushing
+- **Security**: Never log sensitive data, use environment variables for secrets