fix(vsti): crackle fix P1-P3 — SHM 8-slot ring + drain-delta pump + AudioWorklet sink

- SharedMemoryIPC.h/main.cpp: render into ring slot (idx & ringMask), 8 slots
- shm.rs: ring fields + read_ring_audio; lib.rs pump drains FULL delta, not just latest
- bridgeAudioNode.js: AudioWorklet primary (bridge-audio-sink), ScriptProcessor fallback
- bridgeAudioWorklet.js: ring 64 blocks, underrun fade, overrun drop + crossfade
- layout tests: sizeof 27560 (8-align via u64)

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=202608112200"></script>
-    <script src="/static/js/services/bridgeAudioNode.js?v=202608121700"></script>
+    <script src="/static/js/services/bridgeAudioNode.js?v=202608152200"></script>
     <script src="/static/js/services/unifiedMidiRouter.js?v=202608112200"></script>
     <script src="/static/js/services/audioRoutingEngine.js?v=202608112200"></script>
     <script src="/static/js/services/aiGateway.js?v=202608037200"></script>