build: keep the package version in tradingagents.__version__

- pyproject reads the version from tradingagents/__init__.py, so a source checkout, an editable install and a wheel report the same one
- the SEC EDGAR User-Agent names tradingagents.__version__

tests/test_version.py

@@ -0,0 +1,18 @@
+"""The package version has one source, tradingagents.__version__, which the build reads."""
+
+import re
+from pathlib import Path
+
+import pytest
+
+import tradingagents
+
+PYPROJECT = (Path(__file__).resolve().parents[1] / "pyproject.toml").read_text(encoding="utf-8")
+
+
+@pytest.mark.unit
+def test_the_build_reads_the_version_from_the_package():
+    assert re.search(r'^dynamic = \["version"\]', PYPROJECT, re.M)
+    assert 'version = {attr = "tradingagents.__version__"}' in PYPROJECT
+    assert not re.search(r'^version = "', PYPROJECT, re.M)
+    assert re.fullmatch(r"\d+\.\d+\.\d+(\.dev\d+|rc\d+)?", tradingagents.__version__)