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__

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "tradingagents"
-version = "0.5.2.dev0"
+dynamic = ["version"]
 description = "TradingAgents: Multi-Agents LLM Financial Trading Framework"
 readme = "README.md"
 requires-python = ">=3.10"
@@ -42,6 +42,9 @@ bedrock = [
 [project.scripts]
 tradingagents = "cli.main:app"
 
+[tool.setuptools.dynamic]
+version = {attr = "tradingagents.__version__"}
+
 [tool.setuptools.packages.find]
 include = ["tradingagents*", "cli*"]