fix(anthropic): bypass model_dump on content_block_stop#2953
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Anthropic SDK 0.84.0+ types stream events as ParsedMessageStreamEvent, which makes content_block_stop carry a generic ParsedTextBlock that does not match the discriminated union, triggering six Pydantic serialization warnings per invocation. The fix mirrors the existing message_stop workaround from #1746: build the minimal {type, index} dict that format_chunk already consumes instead of round-tripping through model_dump.
Fixes #1865.