v0.0.47: integrate 6 WZP audio variants into featherChat calls

startAudio() now dynamically loads the selected WZP client variant:
- /audio-variant [pure|hybrid|full|ws|ws-fec|ws-full]
- Loads variant JS from wzp-web's /audio/js/ path via Caddy
- Falls back to inline pure implementation if variant fails to load
- Variant persisted in localStorage across sessions
- Call bar shows active variant: "In call [ws-fec] with 0x..."

Variants:
  pure     — raw PCM over WS (bridge needed, no WASM)
  hybrid   — raw PCM + WASM FEC over WS (bridge needed)
  full     — WebTransport + FEC + crypto (no bridge, future)
  ws       — WZP protocol over WS (relay direct)
  ws-fec   — WZP + WASM FEC over WS (relay direct)
  ws-full  — WZP + FEC + E2E crypto over WS (relay direct)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/scripts/test-variants.sh

@@ -122,7 +122,7 @@ do_urls() {
   for i in "${!VARIANTS[@]}"; do
     local sub="${VARIANTS[$i]}"
     local label="${LABELS[$i]}"
-    printf "  │ %-6s │ %-8s │ https://%s.%s/test-room │\n" "$sub" "$label" "$sub" "$BASE_DOMAIN"
+    printf "  │ %-6s │ %-8s │ https://%s.%s/test-room?variant=%s │\n" "$sub" "$label" "$sub" "$BASE_DOMAIN" "$label"
   done
   echo "  └────────┴──────────┴──────────────────────────────────────────┘"
   echo ""
@@ -137,7 +137,7 @@ do_check() {
   for i in "${!VARIANTS[@]}"; do
     local sub="${VARIANTS[$i]}"
     local label="${LABELS[$i]}"
-    local url="https://${sub}.${BASE_DOMAIN}/"
+    local url="https://${sub}.${BASE_DOMAIN}/test-room?variant=${label}"
     local status
     status=$(curl -4 -s -o /dev/null -w "%{http_code}" --connect-timeout 5 "$url" 2>/dev/null || echo "000")
     if [ "$status" = "200" ]; then