mbproxy: remediate the 2026-05-16 code-review findings

Fixes every finding from the codereviews/2026-05-16 multi-agent review
(2 Critical, 20 Major, 38 Minor) and adds that review to the repo.

Highlights: dashboard XSS escape; response cache invalidated on the
write request (not just the response); ReloadValidator now runs at
startup so port collisions / duplicate names / malformed Resilience
profiles fail fast; AdminPort 0 genuinely disables the admin endpoint;
PlcListener accept-loop faults propagate to the supervisor's faulted
path; reconciler Restart builds before removing; Resilience pipelines
are restart-only from a frozen snapshot; multiplexer connect-race leak,
watchdog party-list snapshot, backend-response and FC16 framing
validation; frontend reconnect retry and util.js load guard; plus the
log-event/doc drift sweep and test-port hygiene.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mbproxy/install/publish.ps1

@@ -106,7 +106,9 @@ foreach ($flavour in 'self-contained','framework-dependent') {
         $size = (Get-Item $bin).Length
         Write-Host ("  {0,-22} {1,10}  {2}" -f $flavour, (Format-Size $size), $bin)
     } else {
-        Write-Warning "Missing: $bin"
+        # A missing expected binary means the publish silently produced nothing usable —
+        # fail the script rather than emit a warning a CI job would scroll past.
+        throw "Expected published binary not found: $bin"
     }
 }
 Write-Host ""