chore(lotus): fix stale denoise flag docs + prep 0.20.1-lotus.2

The in-source ML denoiser is gated on lotusDenoiseSource (see lotusDenoise.ts
gate), not the legacy build-time shim flag lotusDenoise=ml. Correct the two
stale references (lotusDenoise.ts JSDoc + InCallView.tsx comment) to
lotusDenoiseSource=1.

Bump the embedded package to 0.20.1-lotus.2 for the next publish and update the
CI comment: the checked-in version now tracks the intended release, while a
pushed tag still wins (npm version "$TAG" overwrites at publish time).

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

src/lotus/lotusDenoise.ts

@@ -25,7 +25,7 @@ import {
  * Element Call audio TrackProcessor (#1), replacing the host's build-time
  * `getUserMedia` monkeypatch.
  *
- * Opt-in via `lotusDenoise=ml` (+ `lotusModel`, `lotusGate`,
+ * Opt-in via `lotusDenoiseSource=1` (+ `lotusModel`, `lotusGate`,
  * `lotusGateThreshold`, `lotusDenoiseBase`). Because the processor is attached
  * to the mic publication and re-attached on every (re)publish, denoise
  * survives EC's mid-call reconnect — fixing the A7 "mic dead after reconnect"

src/room/InCallView.tsx

@@ -301,7 +301,7 @@ export const InCallView: FC<InCallViewProps> = ({
   // them on in-call tile avatars (#6). No-op unless the host sends them.
   useEffect(() => startLotusDecorations(), []);
   // [lotus] Apply ML denoise to the mic as a first-class audio processor that
-  // survives reconnects (#1 / A7). No-op unless lotusDenoise=ml.
+  // survives reconnects (#1 / A7). No-op unless lotusDenoiseSource=1.
   useEffect(() => startLotusDenoise(vm), [vm]);
 
   const fatalCallError = useBehavior(vm.fatalError$);