Add AMD ROCm gaps: Mamba/SSM source builds, GPU monitoring, Windows messaging, RDNA expansion

- worker.py: Add HIP detection to causal-conv1d/mamba-ssm probe, check
  for hipcc before ROCm source builds, improve status messages and error
  reporting, add timeout and uv support for the source build fallback
- amd.py: New AMD GPU monitoring module via amd-smi metric --json,
  mirroring nvidia.py structure (utilization, temperature, power, VRAM)
- hardware.py: Branch to amd.py when IS_ROCM is True for GPU utilization,
  visible GPU queries, and physical GPU count
- install_python_stack.py: Detect AMD GPUs on Windows and warn that
  ROCm-enabled PyTorch must be installed manually
- kernels/utils.py: Expand is_rdna() to cover RDNA2 (gfx1030-1032),
  RDNA3 (gfx1102-1103), RDNA3.5 (gfx1150-1152) alongside existing entries
- tests: Add 32 new tests covering all changes (95/95 pass)

studio/install_python_stack.py

@@ -705,6 +705,19 @@ def install_python_stack() -> int:
         _progress("ROCm torch check")
         _ensure_rocm_torch()
 
+    # Windows + AMD GPU: PyTorch does not publish ROCm wheels for Windows.
+    # Detect and warn so users know manual steps are needed for GPU training.
+    if IS_WINDOWS and not NO_TORCH:
+        if shutil.which("hipinfo") or shutil.which("amd-smi"):
+            _safe_print(
+                _dim("  Note:"),
+                "AMD GPU detected on Windows. ROCm-enabled PyTorch must be",
+            )
+            _safe_print(
+                " " * 8,
+                "installed manually. See: https://docs.unsloth.ai/get-started/install-and-update/amd",
+            )
+
     # 3. Extra dependencies
     _progress("unsloth extras")
     pip_install(