lotus(#1): implement all 4 denoise models; fix gate name + rates

Faithful port of cinny's proven pipeline into the TrackProcessor, closing
protocol gap F3 (host offers rnnoise/speex/dtln/deepfilternet; only the
first two existed in-source).

- Fix real bug: gate worklet registers as "noise-gate" (hyphenated), not
  "noiseGate" — the gated path would have failed to construct the node.
- Per-model sample rate: DTLN runs at 16kHz, others 48kHz (worklets don't
  resample); verify the context actually got the rate, else fall back.
- resume() a suspended context (host postMessage isn't a gesture).
- DTLN via dynamic-imported @workadventure helper (bypassUntilReady);
  DeepFilterNet via dynamic-imported ESM + DeepFilterNet3Core pointed at
  the self-hosted base. Same-origin base (kept from the C1 fix) makes these
  dynamic imports safe.
- Prefer SIMD rnnoise.wasm with non-SIMD fallback; cache wasm per URL.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lotus/lotusDenoise.ts

@@ -53,16 +53,13 @@ function safeAssetBase(raw: string | null): string {
 export function startLotusDenoise(vm: CallViewModel): () => void {
   if (lotusParam("lotusDenoise") !== "ml") return () => undefined;
 
-  const requestedModel = lotusParam("lotusModel");
-  // Only RNNoise/Speex are implemented in-source so far. Don't silently
-  // degrade an unsupported model (e.g. the host's dtln/deepfilternet) to
-  // rnnoise — log it so the mismatch is visible.
-  let model: LotusDenoiseConfig["model"] = "rnnoise";
-  if (requestedModel === "speex") model = "speex";
-  else if (requestedModel && requestedModel !== "rnnoise")
-    logger.warn(
-      `[lotus] denoise model "${requestedModel}" not implemented in-source; using rnnoise`,
-    );
+  const requested = lotusParam("lotusModel");
+  const model: LotusDenoiseConfig["model"] =
+    requested === "speex" ||
+    requested === "dtln" ||
+    requested === "deepfilternet"
+      ? requested
+      : "rnnoise";
 
   const rawThreshold = lotusParam("lotusGateThreshold");
   const config: LotusDenoiseConfig = {