fix(update.ps1): replace Unicode with ASCII + null-safety for PS 5.1

PowerShell 5.1 on Russian Windows reads .ps1 files as ANSI (CP1251),
breaking em dashes and box-drawing characters in comments/strings.
Also fix NullArray error when Select-String finds no version match.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/update.ps1

@@ -1,4 +1,4 @@
-# update.ps1 — Full uplift cycle for claude-skills on Windows (PowerShell)
+# update.ps1 -- Full uplift cycle for claude-skills on Windows (PowerShell)
 #
 # Steps:
 #   1. git pull --ff-only in claude-skills repo
@@ -9,7 +9,7 @@
 #   6. Print reload hints
 #
 # Usage: update.ps1 [-Yes]
-#   -Yes  — skip confirmation prompts (assume yes)
+#   -Yes  -- skip confirmation prompts (assume yes)
 
 [CmdletBinding()]
 param(
@@ -18,7 +18,7 @@ param(
 
 $ErrorActionPreference = 'Stop'
 
-# ── Paths ──────────────────────────────────────────────────────────────────
+# -- Paths -------------------------------------------------------------------
 
 $root = Split-Path -Parent $PSScriptRoot
 $skillsSrc = Join-Path $root 'skills'
@@ -28,22 +28,21 @@ $commonRoot = if ($env:COMMON_ROOT) { $env:COMMON_ROOT } else { Join-Path $env:U
 $metaMcp = Join-Path $commonRoot 'lib\projects-meta-mcp'
 $internsMcp = Join-Path $commonRoot 'lib\interns-mcp'
 
-# ── Collect before-versions ────────────────────────────────────────────────
+# -- Collect before-versions --------------------------------------------------
 
 $beforeVersions = @{}
 if (Test-Path $target) {
-    Get-ChildItem -Path $target -Directory | ForEach-Object {
+    Get-ChildItem -Path $target -Directory -ErrorAction SilentlyContinue | ForEach-Object {
         $vf = Join-Path $_.FullName 'SKILL.md'
         if (Test-Path $vf) {
-            $ver = (Select-String -Path $vf -Pattern '^version:\s*(\d+\.\d+\.\d+)' |
-                     Select-Object -First 1).Matches.Groups[1].Value
-            if (-not $ver) { $ver = '?' }
+            $match = Select-String -Path $vf -Pattern '^version:\s*(\d+\.\d+\.\d+)' -ErrorAction SilentlyContinue | Select-Object -First 1
+            $ver = if ($match) { $match.Matches.Groups[1].Value } else { '?' }
             $beforeVersions[$_.Name] = $ver
         }
     }
 }
 
-# ── Step 1: git pull ────────────────────────────────────────────────────────
+# -- Step 1: git pull ---------------------------------------------------------
 
 Write-Host "`n[update] Pulling claude-skills repo..." -ForegroundColor Cyan
 Push-Location $root
@@ -70,11 +69,11 @@ if ($stashed) {
     Write-Host "[update] Popping stashed changes..." -ForegroundColor Cyan
     git stash pop 2>$null
     if ($LASTEXITCODE -ne 0) {
-        Write-Host "[warn] Could not pop stash — resolve manually" -ForegroundColor Yellow
+        Write-Host "[warn] Could not pop stash -- resolve manually" -ForegroundColor Yellow
     }
 }
 
-# ── Step 2: projects-meta-mcp ─────────────────────────────────────────────
+# -- Step 2: projects-meta-mcp -----------------------------------------------
 
 $mcpRebuilt = $false
 
@@ -101,10 +100,10 @@ if (Test-Path (Join-Path $metaMcp '.git')) {
     }
     Pop-Location
 } else {
-    Write-Host "[warn] projects-meta-mcp not found at $metaMcp — skipping." -ForegroundColor Yellow
+    Write-Host "[warn] projects-meta-mcp not found at $metaMcp -- skipping." -ForegroundColor Yellow
 }
 
-# ── Step 3: interns-mcp ───────────────────────────────────────────────────
+# -- Step 3: interns-mcp -----------------------------------------------------
 
 if (Test-Path (Join-Path $internsMcp '.git')) {
     Write-Host "[update] Checking interns-mcp..." -ForegroundColor Cyan
@@ -127,26 +126,25 @@ if (Test-Path (Join-Path $internsMcp '.git')) {
     }
     Pop-Location
 } else {
-    Write-Host "[warn] interns-mcp not found at $internsMcp — skipping." -ForegroundColor Yellow
+    Write-Host "[warn] interns-mcp not found at $internsMcp -- skipping." -ForegroundColor Yellow
 }
 
-# ── Step 4: Install skills ─────────────────────────────────────────────────
+# -- Step 4: Install skills ---------------------------------------------------
 
 Pop-Location
 Write-Host "[update] Installing skills..." -ForegroundColor Cyan
 & "$root\scripts\install.ps1"
 Write-Host "[ok] Skills installed." -ForegroundColor Green
 
-# ── Step 5: Version diff ───────────────────────────────────────────────────
+# -- Step 5: Version diff -----------------------------------------------------
 
 Write-Host "[update] Version diff:" -ForegroundColor Cyan
 $changes = $false
-Get-ChildItem -Path $target -Directory | ForEach-Object {
+Get-ChildItem -Path $target -Directory -ErrorAction SilentlyContinue | ForEach-Object {
     $vf = Join-Path $_.FullName 'SKILL.md'
     if (Test-Path $vf) {
-        $after = (Select-String -Path $vf -Pattern '^version:\s*(\d+\.\d+\.\d+)' |
-                   Select-Object -First 1).Matches.Groups[1].Value
-        if (-not $after) { $after = '?' }
+        $match = Select-String -Path $vf -Pattern '^version:\s*(\d+\.\d+\.\d+)' -ErrorAction SilentlyContinue | Select-Object -First 1
+        $after = if ($match) { $match.Matches.Groups[1].Value } else { '?' }
         $before = $beforeVersions[$_.Name]
         if (-not $before) { $before = 'new' }
         if ($before -ne $after) {
@@ -159,7 +157,7 @@ if (-not $changes) {
     Write-Host '  (no version changes)'
 }
 
-# ── Step 6: New setup-skills hint ──────────────────────────────────────────
+# -- Step 6: New setup-skills hint -------------------------------------------
 
 $newSetup = @()
 Get-ChildItem -Path $skillsSrc -Directory | ForEach-Object {
@@ -176,7 +174,7 @@ if ($newSetup.Count -gt 0) {
     Write-Host '  Run the setup skill to configure it.'
 }
 
-# ── Step 7: Reload hints ──────────────────────────────────────────────────
+# -- Step 7: Reload hints ----------------------------------------------------
 
 Write-Host ''
 Write-Host '[ok] Update complete!' -ForegroundColor Green