Add Modal dual_gemm leaderboard (697) to NVFP4 data

On-prem hardware measurements became unreliable midway through the
competition, so a second dual_gemm leaderboard was created on Modal
infrastructure. Added 6,637 rows for modal_nvfp4_dual_gemm (leaderboard
697) to the parquet file and documented both variants in the README.

README.md

@@ -35,6 +35,10 @@ This dataset contains GPU kernel submissions from the KernelBot competition plat
 | `nvidia_nvfp4_submissions.parquet` | ~1.4 GB | NVFP4 submissions deduplicated by (user, code), with full code content |
 
 
+**NVFP4 Problems:** gemv (leaderboard 595), gemm (597), dual_gemm (598), modal_dual_gemm (697)
+
+**Note on Dual GEMM:** There are two variants of the dual_gemm problem. Midway through the competition, on-prem hardware measurements became unreliable, so a second leaderboard was created on Modal infrastructure. The Modal measurements (leaderboard 697, `modal_nvfp4_dual_gemm`) are more trustworthy.
+
 **Note:** Scores are execution time in seconds. **Lower is better.**
 
 ## Helper Scripts

nvidia_nvfp4_submissions.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:f727de8e9dadd9558d4e27d98cad1cd059ca840631cb9c636907b3a1250406d6
-size 1500132381
+oid sha256:64f4d29e68f3471b524be55a62f1af58a4d36a0f1f2d191c59a8f5302941e664
+size 1622580981