feat(devkit): enforce governed prompt adoption

packages/casan-devkit/templates/prompt-enforcement/casan-chat.ps1

@@ -0,0 +1,22 @@
+# CASAN_MANAGED_PROMPT_ENTRYPOINT
+[CmdletBinding()]
+param(
+    [Parameter(ValueFromRemainingArguments = $true)]
+    [string[]] $Prompt,
+    [string] $Distro = 'Ubuntu'
+)
+
+$ErrorActionPreference = 'Stop'
+$projectRootWindows = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
+$projectRootWsl = (& wsl.exe -d $Distro -- wslpath -a $projectRootWindows).Trim()
+if (-not $projectRootWsl) {
+    throw 'CASAN could not resolve the project path in WSL2.'
+}
+
+$arguments = @('-d', $Distro, '--cd', $projectRootWsl, './bin/casan-chat')
+if ($Prompt) {
+    $arguments += $Prompt
+}
+
+& wsl.exe @arguments
+exit $LASTEXITCODE