aitools

```powershell
# Pester v4 to v5 Migration Script

# Configuration
$config = @{
    SourceDirectory = "C:\\Tests\\PesterV4"
    TargetDirectory = "C:\\Tests\\PesterV5"
    LogFile = "C:\\Logs\\MigrationLog.txt"
    Verbose = $true
}

# Migration Function
function Migrate-PesterTests {
    param (
        [string]$SourceDirectory,
        [string]$TargetDirectory,
        [string]$LogFile,
        [bool]$Verbose
    )

    # Initialize Log
    Start-Transcript -Path $LogFile -Append

    # Process Each Test File
    Get-ChildItem -Path $SourceDirectory -Filter *.Tests.ps1 | ForEach-Object {
        $testContent = Get-Content -Path $_.FullName
        $updatedContent = $testContent -replace 'Describe', 'Context' -replace 'It', 'It' -replace 'Context', 'Describe'
        $targetPath = $_.FullName -replace [regex]::Escape($SourceDirectory), $TargetDirectory
        $targetPath | New-Item -ItemType Directory -Force
        $targetPath += "\" + $_.Name
        $updatedContent | Out-File -FilePath $targetPath
        if ($Verbose) {
            Write-Host "Migrated: $($_.Name)" -ForegroundColor Green
        }
    }

    # Finalize Log
    Stop-Transcript
}

# Execute Migration
Migrate-PesterTests @config
```