feat(anthropic): support claude-sonnet-5#83
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Sonnet 5 runs adaptive thinking by default (no `thinking` field sent), which streams thinking_delta/signature_delta content_block_delta events that have no `.text`. The provider assumed every delta carried text, so `consume(nil)` crashed with "attempt to concatenate local 'partial' (a nil value)". Guard the streaming handler to only forward text_delta blocks, and add a `claude-sonnet-5` chat prompt with a larger max_tokens so adaptive thinking doesn't crowd out the answer. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Sonnet 5 runs adaptive thinking by default (no
thinkingfield sent), which streams thinking_delta/signature_delta content_block_delta events that have no.text. The provider assumed every delta carried text, soconsume(nil)crashed with "attempt to concatenate local 'partial' (a nil value)".Guard the streaming handler to only forward text_delta blocks, and add a
claude-sonnet-5chat prompt with a larger max_tokens so adaptive thinking doesn't crowd out the answer.