fix(windows): WT-скрипт использует source вместо commandline для PS7

- Зачем:
  - на машине без pwsh в стандартном PATH профиль с `commandline = 'pwsh.exe'` ломался, потому что WT игнорировал динамический `source` в пользу явного `commandline`.
- Что:
  - PS7 профиль теперь управляется через `source = Windows.Terminal.PowershellCore`, `commandline` удаляется.
  - добавлена проверка `Test-PowerShell7Available`: если pwsh не найден, профиль не создаётся.
  - добавлена `Remove-JsonPropertyValue` для идемпотентного удаления свойств.
  - magic string вынесен в константу `$PowerShellSource`.
- Проверка:
  - `chezmoi -S "$HOME\dotfiles\chezmoi" apply --dry-run --verbose`.
  - `pwsh -NoProfile -Command "(Get-Content (Join-Path $env:LOCALAPPDATA 'Packages\Microsoft.WindowsTerminal_8wekyb3d8bbwe\LocalState\settings.json') -Raw | ConvertFrom-Json).profiles.list | Where-Object {$_.source -eq 'Windows.Terminal.PowershellCore'} | ConvertTo-Json"`.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

chezmoi/.chezmoiscripts/run_20-configure-windows-terminal.ps1

@@ -9,6 +9,7 @@ if (-not (Test-Path -LiteralPath $settingsPath)) {
 }
 
 $PowerShellGuid = '{574e775e-4f2a-5b96-ac1e-a2962a402336}'
+$PowerShellSource = 'Windows.Terminal.PowershellCore'
 $LegacyPowerShellGuid = '{61c54bbd-c2c6-5271-96e7-009a87ff44bf}'
 $changed = $false
 
@@ -74,6 +75,30 @@ function Set-JsonPropertyValue {
     }
 }
 
+function Remove-JsonPropertyValue {
+    param(
+        [Parameter(Mandatory = $true)]
+        $Object,
+        [Parameter(Mandatory = $true)]
+        [string]$Name
+    )
+
+    $Property = $Object.PSObject.Properties[$Name]
+    if ($null -ne $Property) {
+        [void]$Object.PSObject.Properties.Remove($Name)
+        $script:changed = $true
+    }
+}
+
+function Test-PowerShell7Available {
+    try {
+        return $null -ne (Get-Command pwsh -ErrorAction SilentlyContinue | Select-Object -First 1)
+    }
+    catch {
+        return $false
+    }
+}
+
 function Test-IsPowerShell7Profile {
     param(
         [Parameter(Mandatory = $true)]
@@ -84,7 +109,7 @@ function Test-IsPowerShell7Profile {
     $Name = [string](Get-JsonPropertyValue -Object $Profile -Name name)
     $CommandLine = [string](Get-JsonPropertyValue -Object $Profile -Name commandline)
 
-    if ($Source -eq 'Windows.Terminal.PowershellCore') {
+    if ($Source -eq $PowerShellSource) {
         return $true
     }
 
@@ -108,7 +133,7 @@ function Test-IsDisposablePowerShell7Profile {
     return (
         $Name -match '^(PowerShell|PowerShell 7)$' -and
         (
-            $Source -eq 'Windows.Terminal.PowershellCore' -or
+            $Source -eq $PowerShellSource -or
             $CommandLine -match '(?i)(^|[\\/ ])pwsh(?:\.exe)?(?:\s|$)'
         )
     )
@@ -166,7 +191,7 @@ for ($i = 0; $i -lt $profiles.Count; $i++) {
 $powerShell7Index = $null
 foreach ($candidateIndex in $powerShell7CandidateIndices) {
     $candidate = $profiles[$candidateIndex]
-    if ([string](Get-JsonPropertyValue -Object $candidate -Name source) -eq 'Windows.Terminal.PowershellCore') {
+    if ([string](Get-JsonPropertyValue -Object $candidate -Name source) -eq $PowerShellSource) {
         $powerShell7Index = $candidateIndex
         break
     }
@@ -177,28 +202,33 @@ if ($null -eq $powerShell7Index -and $powerShell7CandidateIndices.Count -gt 0) {
 }
 
 if ($null -eq $powerShell7Index) {
-    $profiles += [pscustomobject]@{
-        commandline = 'pwsh.exe'
-        guid = $PowerShellGuid
-        hidden = $false
-        name = 'PowerShell 7'
-        startingDirectory = '%USERPROFILE%'
+    if (Test-PowerShell7Available) {
+        # Create a dynamic-profile override instead of a manual pwsh.exe launcher.
+        $profiles += [pscustomobject]@{
+            guid = $PowerShellGuid
+            hidden = $false
+            name = 'PowerShell 7'
+            source = $PowerShellSource
+            startingDirectory = '%USERPROFILE%'
+        }
+        $powerShell7Index = $profiles.Count - 1
+        $changed = $true
+    }
+    else {
+        Write-Warning 'PowerShell 7 was not detected; leaving Windows Terminal default profile unchanged.'
     }
-    $powerShell7Index = $profiles.Count - 1
-    $changed = $true
 }
 
-$powerShell7Profile = $profiles[$powerShell7Index]
-if ([string]::IsNullOrWhiteSpace([string](Get-JsonPropertyValue -Object $powerShell7Profile -Name guid))) {
+if ($null -ne $powerShell7Index) {
+    $powerShell7Profile = $profiles[$powerShell7Index]
     Set-JsonPropertyValue -Object $powerShell7Profile -Name guid -Value $PowerShellGuid
+    Set-JsonPropertyValue -Object $powerShell7Profile -Name source -Value $PowerShellSource
+    Remove-JsonPropertyValue -Object $powerShell7Profile -Name commandline
+    Set-JsonPropertyValue -Object $powerShell7Profile -Name name -Value 'PowerShell 7'
+    Set-JsonPropertyValue -Object $powerShell7Profile -Name hidden -Value $false
+    Set-JsonPropertyValue -Object $powerShell7Profile -Name startingDirectory -Value '%USERPROFILE%'
+    Set-JsonPropertyValue -Object $settings -Name defaultProfile -Value ([string](Get-JsonPropertyValue -Object $powerShell7Profile -Name guid))
 }
-if ($null -eq (Get-JsonPropertyValue -Object $powerShell7Profile -Name commandline) -and [string](Get-JsonPropertyValue -Object $powerShell7Profile -Name source) -ne 'Windows.Terminal.PowershellCore') {
-    Set-JsonPropertyValue -Object $powerShell7Profile -Name commandline -Value 'pwsh.exe'
-}
-Set-JsonPropertyValue -Object $powerShell7Profile -Name name -Value 'PowerShell 7'
-Set-JsonPropertyValue -Object $powerShell7Profile -Name hidden -Value $false
-Set-JsonPropertyValue -Object $powerShell7Profile -Name startingDirectory -Value '%USERPROFILE%'
-Set-JsonPropertyValue -Object $settings -Name defaultProfile -Value ([string](Get-JsonPropertyValue -Object $powerShell7Profile -Name guid))
 
 if ($null -ne $legacyPowerShellIndex) {
     $legacyPowerShellProfile = $profiles[$legacyPowerShellIndex]