@tdd_issue @tdd_issue_2922 @tdd_issue_4178 Feature: A2A Python SDK is a declared project dependency As a CleverAgents developer I want the A2A Python SDK to be listed in pyproject.toml dependencies So that the SDK is always installed and importable in any project environment Background: Given the pyproject.toml file exists at "pyproject.toml" @tdd_issue @tdd_issue_4273 Scenario: a2a-sdk is listed in project dependencies When I read the project dependencies from pyproject.toml Then the dependency list should include a package that provides the "a2a" module @tdd_issue @tdd_issue_4366 Scenario: a2a module is importable as a project dependency When I attempt to import the "a2a" module Then the import should succeed without errors @tdd_issue @tdd_issue_4273 Scenario: a2a SDK provides the Client class When I import "a2a.client" and access "Client" Then the "Client" class should be available