Match Qwen reasoning history across effort changes

docs/issue117-reasoning-history/render.output.log

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+
+running 1 test
+test engine::tokenizer::issue117::issue117_history_renders_tokens_and_context ... {"case":"reasoning_history","cases":304,"renders_ids_history_continuation_context_exact":true}
+ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 560 filtered out; finished in 1.95s
+