Add syncback scripts

syncback.ps1

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+#Requires -Version 5.1
+
+$ProjectRbxl = "Project.rbxl"
+$ProjectJsonFile = "default.project.json"
+
+# Load .env file
+Get-Content ".env" | ForEach-Object {
+  if ($_ -match "^\s*([^#][^=]+)=(.*)$") {
+    Set-Variable -Name $Matches[1].Trim() -Value $Matches[2].Trim() -Scope Script
+  }
+}
+
+$ProjectJson = Get-Content $ProjectJsonFile | ConvertFrom-Json
+$PlaceId = $ProjectJson.servePlaceIds[0]
+Write-Host "PlaceId: $PlaceId"
+
+# Download rbxl from Roblox
+$Url = "https://assetdelivery.roblox.com/v1/asset/?id=$PlaceId"
+$Session = New-Object Microsoft.PowerShell.Commands.WebRequestSession
+$Cookie = New-Object System.Net.Cookie(".ROBLOSECURITY", $ROBLOSECURITY, "/", ".roblox.com")
+$Session.Cookies.Add($Cookie)
+
+Write-Host "Downloading $Url..."
+Invoke-WebRequest -Uri $Url -WebSession $Session -OutFile $ProjectRbxl
+
+if ($args.Count -eq 0) {
+  rojo syncback --non-interactive --input $ProjectRbxl $ProjectJsonFile
+} else {
+  rojo syncback @args --input $ProjectRbxl $ProjectJsonFile
+}

syncback.sh

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+#!/bin/sh
+set -e
+
+ProjectRbxl="Project.rbxl"
+ProjectJsonFile="default.project.json"
+
+# Load .env file (auto-export all variables)
+if [ -f ".env" ]; then
+  set -a
+  . ./.env
+  set +a
+fi
+
+# Extract PlaceId from project json (first number after servePlaceIds line)
+PlaceId=$(grep -A1 'servePlaceIds' "$ProjectJsonFile" | grep -o '[0-9]\+')
+echo "PlaceId: $PlaceId"
+
+# Download rbxl from Roblox
+Url="https://assetdelivery.roblox.com/v1/asset/?id=$PlaceId"
+echo "Downloading $Url..."
+curl -fSL --compressed -o "$ProjectRbxl" -H "Cookie: .ROBLOSECURITY=${ROBLOSECURITY}" "$Url"
+
+if [ $# -eq 0 ]; then
+  rojo syncback --non-interactive --input "$ProjectRbxl" "$ProjectJsonFile"
+else
+  rojo syncback "$@" --input "$ProjectRbxl" "$ProjectJsonFile"
+fi