feat: execute FlashKDA on RTX 5090

experiments/k3/checkpoint_probe.py

@@ -370,11 +370,11 @@ def main() -> None:
                 else None,
                 "libc": list(platform.libc_ver()),
             },
-            "local_build": {
-                "status": "blocked_before_kernel execution",
+            "baseline_host_build": {
+                "status": "blocked in the default CUDA 12.8 environment; superseded by the separate CUDA 13 runtime probe",
                 "attempt_1": "system g++ 15 exceeds CUDA 12.8 host compiler range",
                 "attempt_2": "temporary g++ 13 reaches nvcc, then CUDA 12.8 headers conflict with current glibc math declarations",
-                "interpretation": "GPU architecture is listed by the repository, but the local CUDA 12.8 stack is below the official CUDA 12.9 requirement",
+                "interpretation": "this snapshot records the first host path only; see src/data/k3-flashkda-runtime.json for the successful isolated build and RTX 5090 execution",
             },
         },
     }