Trim verbose review-fix comments

Shorten multi-line comments added during review iterations to 1-2 lines
each. Remove redundant explanations where the code is self-evident.

install.ps1

@@ -784,9 +784,7 @@ shell.Run cmd, 0, False
 
     # ── Install Python if no compatible version found ──
     # Find-CompatiblePython returns @{ Version = "3.13"; Path = "C:\...\python.exe" } or $null.
-    # AMD + torch path requires Python 3.12 specifically (Radeon only publishes
-    # cp312 wheels for Windows). AMD + --no-torch (GGUF-only) is fine with any
-    # 3.11-3.13, since the cp312 constraint only applies to the ROCm wheels.
+    # AMD + torch requires Python 3.12 (Radeon wheels are cp312 only).
     if ($HasAmdGpu -and -not $SkipTorch) {
         $PythonPreferred = @("3.12")
         $PythonVersion = "3.12"

studio/install_python_stack.py

@@ -438,10 +438,8 @@ def _has_usable_nvidia_gpu() -> bool:
     """Return True only when nvidia-smi exists AND reports at least one GPU."""
     exe = shutil.which("nvidia-smi")
     if not exe and IS_WINDOWS:
-        # nvidia-smi.exe is often absent from PATH on Windows even with a
-        # valid driver.  Match the fallback paths used in install.ps1 /
-        # setup.ps1 so the NVIDIA-wins-on-mixed-systems rule is consistent
-        # between the PowerShell and Python install paths.
+        # nvidia-smi.exe is often not on PATH on Windows; match the
+        # fallback paths in install.ps1 / setup.ps1.
         _candidates = [
             os.path.join(
                 os.environ.get("ProgramFiles", r"C:\Program Files"),
@@ -498,10 +496,8 @@ def _ensure_rocm_torch_windows() -> None:
     troubleshooting notes flag pip dep-resolver overwrite scenarios on
     this procedure.
     """
-    # Cheap idempotency probe first -- no subprocess spawn needed when
-    # torch already links against ROCm (common at step 13 and on updates).
-    # Placed before the expensive GPU-detection calls so the happy-path
-    # (ROCm already installed) avoids two subprocess spawns entirely.
+    # Cheap idempotency probe first -- skip GPU detection when torch
+    # already links against ROCm (common at step 13 and on updates).
     try:
         _probe = subprocess.run(
             [
@@ -525,9 +521,8 @@ def _ensure_rocm_torch_windows() -> None:
     if not _has_rocm_gpu_windows():
         return
 
-    # Radeon wheels are cp312 only.  Hard-exit so the caller (setup.ps1 or
-    # install.ps1) sees a non-zero exit code instead of continuing with a
-    # CPU-only torch that silently reports success.
+    # Radeon wheels are cp312 only. Hard-exit so the caller sees a
+    # non-zero code instead of silently leaving CPU-only torch.
     if (sys.version_info.major, sys.version_info.minor) != (3, 12):
         _safe_print(
             _red(

studio/setup.ps1

@@ -1510,14 +1510,9 @@ if (Test-Path $VenvDir -PathType Container) {
         $shouldRebuild = $true
     }
 
-    # --no-torch: skip ROCm torch repair and wheel install entirely.
-    # Must be defined here (before stale-venv detection) because the
-    # expectedTorchTag and $_NeedRocmRepair logic below depend on it.
+    # Must be defined before stale-venv detection (expectedTorchTag depends on it).
     $_NoTorch = $env:UNSLOTH_NO_TORCH -in @("1", "true", "True", "TRUE")
-
-    # $_NeedRocmRepair is used later to override the version fast-path
-    # ($SkipPythonDeps) so the ROCm install block still runs even when
-    # the unsloth package is already at the latest version.
+    # Overrides $SkipPythonDeps so the ROCm block runs even when unsloth is current.
     $_NeedRocmRepair = $false
 
     if (-not $shouldRebuild) {
@@ -1529,12 +1524,9 @@ if (Test-Path $VenvDir -PathType Container) {
             $expectedTorchTag = "cpu"
         }
         if ($installedTorchTag -and $installedTorchTag -ne $expectedTorchTag) {
-            # Existing Windows AMD users commonly have a CPU-only venv from
-            # pre-ROCm installs.  Rebuilding from scratch would delete the
-            # venv and then exit with "Run install.ps1 first" because
-            # setup.ps1 cannot recreate the venv on its own.  Instead, keep
-            # the venv and let the ROCm install block below repair torch
-            # in-place -- the end state is the same but no work is lost.
+            # Keep the venv and let the ROCm block below repair torch
+            # in-place; rebuilding would delete it and exit since
+            # setup.ps1 cannot recreate a venv on its own.
             if ($HasAmdGpu -and -not $_NoTorch -and $installedTorchTag -eq "cpu") {
                 substep "CPU-only torch detected on AMD host; will repair to ROCm in place..." "Yellow"
                 $_NeedRocmRepair = $true
@@ -1671,8 +1663,7 @@ $env:TORCHINDUCTOR_CACHE_DIR = $TorchCacheDir
 [Environment]::SetEnvironmentVariable('TORCHINDUCTOR_CACHE_DIR', $TorchCacheDir, 'User')
 substep "TORCHINDUCTOR_CACHE_DIR set to $TorchCacheDir (avoids MAX_PATH issues)"
 
-# $_NoTorch was already initialized earlier (before stale-venv detection)
-# so it is available here for the $CuTag selection.
+# $_NoTorch initialized earlier (before stale-venv detection).
 
 if ($HasNvidiaSmi) {
     $CuTag = Get-PytorchCudaTag
@@ -1707,9 +1698,8 @@ if ($CuTag -eq "rocm") {
         exit 1
     }
 
-    # Radeon wheels are cp312 only. Hard-stop when the venv's Python is a
-    # different minor version -- continuing would download multi-GB wheels
-    # that pip will reject with a confusing incompatible-wheel error.
+    # Radeon wheels are cp312 only. Hard-stop instead of downloading
+    # multi-GB wheels that pip will reject.
     try {
         $venvPyVer = (& python -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')" 2>$null | Out-String).Trim()
     } catch { $venvPyVer = "" }
@@ -1724,10 +1714,7 @@ if ($CuTag -eq "rocm") {
         exit 1
     }
 
-    # Skip the expensive reinstall when ROCm torch is already healthy.
-    # Mirrors the idempotency guard in _ensure_rocm_torch_windows() --
-    # without this, fresh installs (install.ps1 -> setup.ps1) and every
-    # `unsloth studio update` would re-download 2.1-3.9 GB unnecessarily.
+    # Skip reinstall when ROCm torch is already healthy (idempotency guard).
     $_existingHip = ""
     try {
         $_existingHip = (& python -c "import torch; print(getattr(torch.version,'hip','') or '')" 2>$null | Out-String).Trim()