* fix(anthropic): keep refusal stop_reason and stop_details on the logged response
* fix(anthropic): keep the refusal stop-fields boundary tolerant of a non-dict upstream body
* test(anthropic): use Anthropic's documented refusal example as the unit-test fixture
* fix(streaming): keep provider fields on async stream cache hits and received_model_id on synthesized finish chunks
* fix(caching): replay cached completion_tokens_details on stream cache hits and skip non-object cached provider fields
* test(integration): cover Anthropic-family refusal stop_details on the wire, the cache and under chaos
* fix(caching): skip a cached completion_tokens_details that fails validation on stream replay
* fix(anthropic): keep refusal stop fields on a JSON-mode non-stream response
Also adds the round 3 audit cells for JSON-mode refusals, the proxy response serialization, and wrong-typed cached usage details on both stream replays
* test(anthropic): expect content_filter on streamed JSON tool refusals after main's stream change
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Co-authored-by: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
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