4bd9abdebc
Add awaiting_llm_first_token (#201) and affect_update (#204) to issue #1's Event union and TESTS via a dated amendment. Both events are parsed by _envelope_for_type and covered in tests/test_sse_client.py, but issue #1's Output union + full_event_vocab test were frozen at the v0.19.0 baseline's 8-event set — contract-vs-code drift surfaced during the Worldtree #371 SDK parity-matrix pass. Documentation-only: no code change, no version bump.