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* python: implement ADR-0029 service_session_id lifecycle mapping - Extend AgentSession service_session_id to support structured values - Add agent-owned conversation id extraction for chat forwarding and telemetry - Migrate A2A durable continuation state to A2AServiceSessionId - Keep A2AAgentSession as compatibility shim and mark it deprecated - Update core/a2a tests and package guidance Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fix service_session_id type fallout across packages Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fix remaining test typing signatures for service_session_id Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fix hosting test stubs for widened get_session type Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fix remaining test stubs for get_session union type Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Simplify A2A session state handling Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix import * Fix hosting-telegram test get_session typing Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>