V45: D17 seamless loop wrap + D18 stop solo note-off (Qin) + D18b/c guard + engine VST load fixes

- D17: wrap_info/wrap-skip, fx wrap xfade, playhead-derived scheduling
- D18: solo stop -> NOTE_OFF all sounding timeline pitches + CC123/CC120
- D18b: track audible gain guard, tracksRef fallback
- D18c: timelinePitchesRef per-track Set, kill at applyAllTrackMuteSolo
- bridge ring _MAX 16, index v=202608290928
- plugins.py/vst_engine.py/fx_realtime.py/JuceFxEngine.cpp: VSTi load + Qin fixes (uncommitted 12:18)

app/templates/index.html

@@ -40,7 +40,7 @@
     <script src="/static/js/services/soundfontStorage.js?v=202607271016"></script>
     <script src="/static/js/services/soundfontPlayer.js?v=202608101800"></script>
     <script src="/static/js/services/nativeBridgeService.js?v=202608250700"></script>
-    <script src="/static/js/services/bridgeAudioNode.js?v=202608250700"></script>
+    <script src="/static/js/services/bridgeAudioNode.js?v=202608291200"></script>
     <script src="/static/js/services/unifiedMidiRouter.js?v=202608271630"></script>
     <script src="/static/js/services/audioRoutingEngine.js?v=202608250700"></script>
     <script src="/static/js/services/aiGateway.js?v=202608037200"></script>
@@ -51,7 +51,7 @@
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
     <script src="/static/js/services/chordTheory.js?v=202608211300"></script>
-    <script src="/static/js/app.precompiled.js?v=202608281631" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608290928" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {