✨(agents) use uv for dependency management

Change from pip to uv for dependancy management in src/agents.

src/agents/pyproject.toml

@@ -18,12 +18,8 @@ dev = [
     "ruff==0.15.6",
 ]
 
-[tool.setuptools]
-py-modules = ["multi_user_transcriber", "metadata_collector", "exceptions"]
-
-[build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
+[tool.uv]
+package = false
 
 [tool.ruff]
 target-version = "py313"