test(server): Claude assistant text streams before the final snapshot

Regression test for #17270: the Claude adapter ignores text_delta stream
events, so a long answer appears only once the completed assistant
snapshot arrives.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
e22e3b7310Julius Marminge committed on 10/24/2026, 10:41:18 AMparent27e0c68
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