fix(codex): recover from null-output stream snapshots

[PeterBerthelsen]

Summary

• recover Codex Responses streams when the OpenAI SDK crashes parsing a terminal response snapshot with output=None
• reuse collected response.output_item.done items or streamed text instead of failing over through every model
• add a regression test for the SDK TypeError path

Validation

• /home/peter/.hermes/hermes-agent/venv/bin/python -m pytest -o addopts="-m 'not integration'" tests/run_agent/test_run_agent_codex_responses.py::test_run_codex_stream_recovers_when_completed_snapshot_has_null_output tests/run_agent/test_run_agent_codex_responses.py::test_run_codex_stream_fallback_parses_create_stream_events -q
• Real Hermes Codex one-shot returned OK locally after patch

[alt-glitch]

Duplicate of #32884 — same Codex Responses null output recovery. Root cause tracked in #11179.

[teknium1]

Closing as duplicate — the Codex null-output fix has been merged via #32963 (cherry-picked from @carltonawong's PR #32890, the one Gille reviewed). Thanks for jumping on the outage so quickly; appreciate the help. Closes #11179.