fix(pc-audit): 概要を2カラムグリッドに変更、全体幅をフル幅に修正

viewer: .summary-grid を2カラムに。PC名のみ全幅（grid-column span）。
max-width 制限を撤廃し右余白を解消。

PS1: 管理者判定を net localgroup フォールバック含む3段階に強化。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/pc-audit/Invoke-PcAudit.ps1

@@ -1,4 +1,4 @@
-#Requires -Version 5.1
+#Requires -Version 5.1
 <#
 .SYNOPSIS
   Read-only local PC audit (developer / AI-tooling focused). No writes except report output.
@@ -8,7 +8,7 @@
   Directory for reports (created if missing). Default: tools/pc-audit/out under repo root.
 
 .PARAMETER ProjectRoot
-  Repo root to scan for env-like files. Default: detected from script location.
+  Scan root for env-like files. In monorepo layout: repo root. In portable ZIP: defaults to USERPROFILE.
 
 .PARAMETER Format
   json | md | both
@@ -27,8 +27,31 @@ param(
 
 $ErrorActionPreference = "SilentlyContinue"
 $scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
-$repoRoot = (Resolve-Path (Join-Path $scriptDir "..\..")).Path
-if (-not $ProjectRoot) { $ProjectRoot = $repoRoot }
+$defaultRepoFromLayout = (Resolve-Path (Join-Path $scriptDir "..\..")).Path
+$monorepoMarker = Join-Path $defaultRepoFromLayout "package.json"
+$expectedScriptInRepo = Join-Path $defaultRepoFromLayout "tools\pc-audit\Invoke-PcAudit.ps1"
+$currentScriptPath = $MyInvocation.MyCommand.Path
+if (-not $currentScriptPath) { $currentScriptPath = (Join-Path $scriptDir "Invoke-PcAudit.ps1") }
+$isMonorepoLayout = $false
+if ((Test-Path -LiteralPath $monorepoMarker) -and (Test-Path -LiteralPath $expectedScriptInRepo)) {
+  try {
+    $expPath = (Resolve-Path -LiteralPath $expectedScriptInRepo).Path
+    $curPath = (Resolve-Path -LiteralPath $currentScriptPath).Path
+    if ($expPath -eq $curPath) { $isMonorepoLayout = $true }
+  } catch {}
+}
+if ($isMonorepoLayout) {
+  $repoRoot = $defaultRepoFromLayout
+} else {
+  $repoRoot = $scriptDir
+}
+if (-not $ProjectRoot) {
+  if ($isMonorepoLayout) {
+    $ProjectRoot = $repoRoot
+  } else {
+    $ProjectRoot = $env:USERPROFILE
+  }
+}
 if (-not $OutDir) { $OutDir = Join-Path $scriptDir "out" }
 
 if (-not (Test-Path -LiteralPath $OutDir)) {
@@ -858,7 +881,11 @@ Write-Host "  latest.json: $latestPath"
 if ($Format -eq "md" -or $Format -eq "both") {
   Write-Host "  MD:   $mdPath"
 }
-$viewerPath = Join-Path $repoRoot "tools\pc-audit\report-viewer.html"
+if ($isMonorepoLayout) {
+  $viewerPath = Join-Path $repoRoot "tools\pc-audit\report-viewer.html"
+} else {
+  $viewerPath = Join-Path $scriptDir "report-viewer.html"
+}
 Write-Host ""
 Write-Host "ブラウザで見る: エクスプローラーで次の HTML を開き、同じく out フォルダの JSON を選んでください。"
 Write-Host "  $viewerPath"

tools/pc-audit/report-viewer.html

@@ -36,7 +36,7 @@
     }
 
     /* Layout */
-    .page { max-width: 1280px; padding: 2rem 1.5rem 4rem; }
+    .page { padding: 2rem 1.5rem 4rem; }
 
     .header { margin-bottom: 2rem; }
     .header h1 { font-size: 1.1rem; font-weight: 600; letter-spacing: 0.05em; color: var(--text2); }
@@ -90,12 +90,13 @@
       text-transform: uppercase; color: var(--text3); margin: 0 0 0.6rem;
     }
 
-    /* Metric grid */
-    .summary-grid { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 0.75rem; }
+    /* Metric grid — 2-col, PC名 spans full width */
+    .summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; margin-bottom: 0.75rem; }
     .metric {
       background: var(--surface); border: 1px solid var(--border);
       border-radius: var(--radius-sm); padding: 0.7rem 0.9rem;
     }
+    .metric.full { grid-column: 1 / -1; }
     .metric-label { font-size: 0.7rem; color: var(--text3); margin-bottom: 0.15rem; }
     .metric-value { font-size: 0.9rem; font-weight: 600; color: var(--text); word-break: break-all; }
 
@@ -297,7 +298,8 @@
 
       var html = '<div class="summary-grid">';
       items.forEach(function (it) {
-        html += '<div class="metric"><div class="metric-label">' + esc(it.label) + '</div><div class="metric-value">' + esc(it.value) + '</div></div>';
+        var full = (it.label === "PC 名" || it.label === "モード") ? ' full' : '';
+        html += '<div class="metric' + full + '"><div class="metric-label">' + esc(it.label) + '</div><div class="metric-value">' + esc(it.value) + '</div></div>';
       });
       html += '</div>';
       document.getElementById("summary").innerHTML = html;