docs(agents): Add agents/claude files

Author: fgmacedo

AGENTS.md

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+# python-statemachine
+
+Python Finite State Machines made easy.
+
+## Project overview
+
+A library for building finite state machines in Python, with support for sync and async engines,
+Django integration, diagram generation, and a flexible callback/listener system.
+
+- **Source code:** `statemachine/`
+- **Tests:** `tests/`
+- **Documentation:** `docs/` (Sphinx + MyST Markdown, hosted on ReadTheDocs)
+
+## Architecture
+
+- `statemachine.py` — Core `StateMachine` class
+- `factory.py` — `StateMachineMetaclass` handles class construction, state/transition validation
+- `state.py` / `event.py` — Descriptor-based `State` and `Event` definitions
+- `transition.py` / `transition_list.py` — Transition logic and composition (`|` operator)
+- `callbacks.py` — Priority-based callback registry (`CallbackPriority`, `CallbackGroup`)
+- `dispatcher.py` — Listener/observer pattern, `callable_method` wraps callables with signature adaptation
+- `signature.py` — `SignatureAdapter` for dependency injection into callbacks
+- `engines/sync.py`, `engines/async_.py` — Sync and async run-to-completion engines
+- `registry.py` — Global state machine registry (used by `MachineMixin`)
+- `mixins.py` — `MachineMixin` for domain model integration (e.g., Django models)
+- `spec_parser.py` — Boolean expression parser for condition guards
+- `contrib/diagram.py` — Diagram generation via pydot/Graphviz
+
+## Environment setup
+
+```bash
+uv sync --all-extras --dev
+pre-commit install
+```
+
+## Running tests
+
+Always use `uv` to run commands:
+
+```bash
+# Run all tests (parallel)
+uv run pytest -n auto
+
+# Run a specific test file
+uv run pytest tests/test_signature.py
+
+# Run a specific test
+uv run pytest tests/test_signature.py::TestSignatureAdapter::test_wrap_fn_single_positional_parameter
+
+# Skip slow tests
+uv run pytest -m "not slow"
+```
+
+Tests include doctests from both source modules (`--doctest-modules`) and markdown docs
+(`--doctest-glob=*.md`). Coverage is enabled by default.
+
+## Linting and formatting
+
+```bash
+# Lint
+uv run ruff check .
+
+# Auto-fix lint issues
+uv run ruff check --fix .
+
+# Format
+uv run ruff format .
+
+# Type check
+uv run mypy statemachine/ tests/
+```
+
+## Code style
+
+- **Formatter/Linter:** ruff (line length 99, target Python 3.13)
+- **Rules:** pycodestyle, pyflakes, isort, pyupgrade, flake8-comprehensions, flake8-bugbear, flake8-pytest-style
+- **Imports:** single-line, sorted by isort
+- **Docstrings:** Google convention
+- **Naming:** PascalCase for classes, snake_case for functions/methods, UPPER_SNAKE_CASE for constants
+- **Type hints:** used throughout; `TYPE_CHECKING` for circular imports
+- Pre-commit hooks enforce ruff + mypy + pytest
+
+## Design principles
+
+- **Decouple infrastructure from domain:** Modules like `signature.py` and `dispatcher.py` are
+  general-purpose (signature adaptation, listener/observer pattern) and intentionally not coupled
+  to the state machine domain. Prefer this separation even for modules that are only used
+  internally — it keeps responsibilities clear and the code easier to reason about.
+- **Favor small, focused modules:** When adding new functionality, consider whether it can live in
+  its own module with a well-defined boundary, rather than growing an existing one.
+
+## Building documentation
+
+```bash
+# Build HTML docs
+uv run sphinx-build docs docs/_build/html
+
+# Live reload for development
+uv run sphinx-autobuild docs docs/_build/html --re-ignore "auto_examples/.*"
+```
+
+## Git workflow
+
+- Main branch: `develop`
+- PRs target `develop`
+- Releases are tagged as `v*.*.*`
+- Signed commits preferred (`git commit -s`)
+- Use [Conventional Commits](https://www.conventionalcommits.org/) messages
+  (e.g., `feat:`, `fix:`, `refactor:`, `test:`, `docs:`, `chore:`, `perf:`)
+
+## Security
+
+- Do not commit secrets, credentials, or `.env` files
+- Validate at system boundaries; trust internal code

CLAUDE.md

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+AGENTS.md