API discovery fails for project using namespace package

## Description I am trying to use great-docs in my package [firebird-base](https://github.com/FirebirdSQL/python3-base). I have created hatch environment for it in my `pyproject.toml`, initialized it and adjusted `great-docs.yml`. My package uses standard `src` scheme, but uses namespace package `firebird`, so it resides in `src/firebird/base` and imports start as `firebird.base.<module>`. File `src/firebird/base/__init__.py` does not do any imports. The `great-docs scan` fails to locate the API with: ``` ────────────────────────────────────────────────── 📡 Discovery ────────────────────────────────────────────────── Package: firebird_base Warning: Could not load package with griffe (ImportError) Falling back to __all__ discovery Could not locate __init__.py for package 'firebird_base' No exports discovered. ``` Adding next to `great-docs.yml` does not help: ``` module: firebird.base ``` ## Reproducible example - Clone `firebird-base` - Add next to `pyproject.toml`: ``` [tool.hatch.envs.gdocs] dependencies = [ "great-docs", ] [tool.hatch.envs.gdocs.scripts] init = "great-docs init" scan = "great-docs scan" build = "great-docs build" preview = "great-docs preview" ``` - Either run `hatch run gdocs:init` & `hatch run gdocs:scan` or enter the environment via `hatch shell gdocs` and run required commands from there.