Add OSC 9;9 support for PowerShell prompt to enable Windows Terminal directory tracking

Co-authored-by: DRSDavidSoft <[email protected]>

Author: Copilot

vendor/profile.ps1

@@ -196,6 +196,15 @@ if ( $(Get-Command prompt).Definition -match 'PS \$\(\$executionContext.SessionS
     [ScriptBlock]$Prompt = {
         $lastSUCCESS = $?
         $realLastExitCode = $LastExitCode
+        
+        # Emit OSC 9;9 sequence for Windows Terminal directory tracking
+        # This enables "Duplicate Tab" and "Split Pane" to preserve the working directory
+        # Only active in Windows Terminal ($env:WT_SESSION) or ConEmu ($env:ConEmuPID)
+        $loc = $executionContext.SessionState.Path.CurrentLocation
+        if (($env:WT_SESSION -or $env:ConEmuPID) -and $loc.Provider.Name -eq "FileSystem") {
+            Microsoft.PowerShell.Utility\Write-Host -NoNewline "$([char]27)]9;9;`"$($loc.ProviderPath)`"$([char]27)\"
+        }
+        
         $host.UI.RawUI.WindowTitle = Microsoft.PowerShell.Management\Split-Path $pwd.ProviderPath -Leaf
         Microsoft.PowerShell.Utility\Write-Host -NoNewline "$([char]0x200B)`r$([char]0x1B)[K"
         if ($lastSUCCESS -or ($LastExitCode -ne 0)) {