Fix entry point format to use standard module.path:attribute convention

[FernandoCelmer]

Problem

The Module.import_module() method in dotflow/core/module.py uses rpartition(".") to split the entry point string:

module_path, _, attr_name = value.rpartition(".")

This forces the format module.path.attribute (all dots), which diverges from the Python packaging standard used by every major Python tool (Gunicorn, Uvicorn, Celery, setuptools, pyproject.toml).

Standard format

The Python ecosystem standard is module.path:attribute — dots for the module path, colon as separator before the attribute:

Tool	Example
Gunicorn	main:app
Uvicorn	package.module:app
Celery	proj.celery:app
setuptools	mymodule:main
Python spec	importable.module:object.attr

Reference: https://packaging.python.org/specifications/entry-points/

Fix

Change rpartition(".") to rpartition(":") in dotflow/core/module.py:

module_path, _, attr_name = value.rpartition(":")

Impact

• CLI usage changes from dotflow start --step my_module.my_step to dotflow start --step my_module:my_step
• Breaking change — requires updating all examples and docs