Expand test coverage across server, agent, and web; fix bugs found during audit.

Adds hundreds of unit/integration/e2e tests, fixes WS bcrypt auth, config merge, fleet analytics, agent schedule/log tail, and documents stale PROBLEMS items. Updates PROBLEMS.md, README, and test scripts; ignores local spread-kits and coverage dirs.

scripts/test-suite.ps1

@@ -111,6 +111,12 @@ if (-not $SkipE2E) {
     Invoke-Phase "8/8 E2E smoke (Playwright)" {
         $DataDir = Join-Path $env:TEMP ("aether-e2e-" + [guid]::NewGuid().ToString("n"))
         New-Item -ItemType Directory -Force -Path $DataDir | Out-Null
+        $E2EUser = if ($env:AETHERFORGE_E2E_USER) { $env:AETHERFORGE_E2E_USER } else { "testuser" }
+        $E2EPass = if ($env:AETHERFORGE_E2E_PASS) { $env:AETHERFORGE_E2E_PASS } else { "testpass" }
+        $usersObj = @{ $E2EUser = $E2EPass }
+        [System.IO.File]::WriteAllText((Join-Path $DataDir "users.json"), ($usersObj | ConvertTo-Json -Compress))
+        $env:AETHERFORGE_E2E_USER = $E2EUser
+        $env:AETHERFORGE_E2E_PASS = $E2EPass
         $WebRoot = Join-Path $Root "server\webroot"
         Copy-Item (Join-Path $Root "server\web\dist\*") $WebRoot -Recurse -Force -ErrorAction SilentlyContinue
         $ServerExe = Join-Path $Root "bin\miner-server.exe"