- codex_runtime._CODEX_PROGRESS_DELTA_TYPES gains response.refusal.delta so the
stream watchdog sees progress on a refusal-only stream instead of timing it
out as idle.
- auxiliary_client._parse_codex_final_response reads type=refusal content
parts; without it an aux refusal-only turn parsed to content=None and hit the
empty-response path the main loop was just taught to avoid.
- tests: parametrize test_streamed_refusal_accumulated (refusal-only /
alongside-content) so there is one test per surface; drop upstream product
references from docstrings (credit stays in the PR body); pass encoding= to
the read_text calls flagged by the Windows footgun scanner.
- docs: fallback-providers notes that a streamed refusal is a terminal
content_filter result, not an empty response to retry.
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