Canonicalize blank reasoning blocks#519
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Summary
Why
A replayed assistant turn can carry an empty reasoning block as whitespace, for example
<think> </think>, while the live KV prefix may contain<think></think>. That difference is semantically empty but changes the rendered prompt bytes/tokens and can cause a live KV cache token mismatch.Tests
make ds4_test && ./ds4_test --server && make ds4-server