Improve UI startup after runspace overhaul (#5056)

* perf: keep UI startup responsive

* test: make favicon checks runner-safe

* fix: qualify favicon visibility state

* test: isolate favicon visibility fixture

* fix: enforce total favicon deadline

* fix: address favicon review feedback

* fix: recognize disabled SSH firewall rule

* perf: restore favicon download throughput

* docs: allow public PR review uploads

* perf: restore overlapping favicon loading

functions/private/Write-WinUtilLog.ps1

@@ -32,6 +32,12 @@ function Write-WinUtilLog {
         [switch]$Detail
     )
 
+    # UI performance diagnostics are useful to developers but are too noisy for the release
+    # transcript. Compile.ps1 stamps local builds so DEBUG output cannot leak into CI artifacts.
+    if ($Level -eq "DEBUG" -and ($null -eq $sync -or -not $sync.IsLocalCompile)) {
+        return
+    }
+
     if ($Level -eq "ERROR" -and -not $Detail -and $null -ne $sync.LoggedErrors) {
         $null = $sync.LoggedErrors.Add("[$Component] $Message")
     }