[Spec] Add DSpark: confidence-scheduled speculative decoding (#30261)

Co-authored-by: sglang-bot <232288953+sglang-bot@users.noreply.github.com>
Co-authored-by: Claude Code <noreply@anthropic.com>
Co-authored-by: Codex <noreply@openai.com>
Co-authored-by: Liangsheng Yin <lsyincs@gmail.com>
Co-authored-by: Liangsheng Yin <hnyls2002@gmail.com>

test/registered/unit/model_executor/test_pool_configurator.py

@@ -121,6 +121,7 @@ def _make_model_runner(
     spec.is_eagle.return_value = False
     spec.is_standalone.return_value = False
     spec.is_dflash.return_value = False
+    spec.is_dflash_family.return_value = False
     spec.is_none.return_value = True
     mr.spec_algorithm = spec