chore: establish local platform baseline

scripts/check.ps1

@@ -0,0 +1,28 @@
+$ErrorActionPreference = 'Stop'
+$PSNativeCommandUseErrorActionPreference = $true
+$projectRoot = Split-Path -Parent $PSScriptRoot
+Set-Location -LiteralPath $projectRoot
+
+$unformatted = gofmt -l cmd internal
+if ($unformatted) {
+    throw "The following Go files are not formatted:`n$($unformatted -join "`n")"
+}
+
+go vet ./...
+# Database-backed packages share the seeded local tenant. Run packages
+# sequentially whenever integration variables are present so temporary SaaS
+# fixtures cannot become visible to identity assertions in another package.
+go test -p 1 '-coverprofile=coverage.out' ./...
+
+Push-Location web
+try {
+    npm ci
+    npm run generate:api
+    npm run typecheck
+    npm run build
+} finally {
+    Pop-Location
+}
+
+docker compose config --quiet
+Write-Host 'All local checks passed.'