ci: tag-gated nightly migration — foundation + 40 whole-file moves (#24725)

Co-authored-by: hnyls2002 <lsyincs@gmail.com>
Co-authored-by: Liangsheng Yin <hnyls2002@gmail.com>

test/manual/spec/test_spec_ngram_fa3.py

@@ -0,0 +1,18 @@
+"""NGRAM speculative-decoding test, FA3 attention-backend variant.
+
+Backend: `--attention-backend fa3`.
+Not registered in any CI suite -- runnable manually only.
+"""
+
+import unittest
+
+from sglang.test.kits.eval_accuracy_kit import GSM8KMixin
+from sglang.test.server_fixtures.ngram_fixture import NgramServerBase
+
+
+class TestNgramSpeculativeDecodingBase(NgramServerBase, GSM8KMixin):
+    attention_backend = "fa3"
+
+
+if __name__ == "__main__":
+    unittest.main()