Enforce recipient-bound single-use invites and fix issue card layout; clean release tooling

scripts/process1.ps1

@@ -5,6 +5,7 @@ param(
 )
 
 $ErrorActionPreference = "Stop"
+. (Join-Path $PSScriptRoot 'env_build_number.ps1')
 
 $repoRoot = Resolve-Path "$PSScriptRoot\.."
 Set-Location $repoRoot
@@ -172,16 +173,8 @@ function Update-BuildFiles {
     $envPath = Join-Path $repoRoot ".env"
     if (Test-Path $envPath) {
         $envContent = Read-TextFile -Path ".env"
-        if ($envContent -match '^BUILD_NUMBER=.*$') {
-            $updatedEnv = [regex]::Replace(
-                $envContent,
-                '^BUILD_NUMBER=.*$',
-                "BUILD_NUMBER=$BuildNumber",
-                [System.Text.RegularExpressions.RegexOptions]::Multiline
-            )
-        } else {
-            $updatedEnv = "BUILD_NUMBER=$BuildNumber`n$envContent"
-        }
+        # Remove previous assignments before adding exactly one build number.
+        $updatedEnv = Set-EnvBuildNumber -Content $envContent -BuildNumber $BuildNumber
         Write-TextFile -Path ".env" -Content $updatedEnv
     }