Replace Unicode arrows/dashes with ASCII in engine.ps1 and run-all.ps1

Windows PowerShell (5.1) reads .ps1 files without a UTF-8 BOM using the
system codepage, which mangles multi-byte UTF-8 characters like -> and --
into garbage that includes smart-quote characters PowerShell treats as
string terminators - this broke parsing on Melissa's PC (error at
engine.ps1:283, cascading missing-brace errors above it). Sticking to plain
ASCII avoids the whole encoding-dependent failure class.

run-all.ps1

@@ -27,5 +27,5 @@ Write-Host ""
 if (-not $anyFail) {
     Write-Host "All entities complete." -ForegroundColor Green
 } else {
-    Write-Host "One or more entities had failures — check output above." -ForegroundColor Yellow
+    Write-Host "One or more entities had failures - check output above." -ForegroundColor Yellow
 }