fix: use feat/call-signaling-upstream messages-send.ts (no biz/bot nodes)
Replace master's complex messages-send.ts with the simpler version from feat/call-signaling-upstream that has no biz node, no bot node, no getButtonType, no enableInteractiveMessages — matching the exact code that was validated working for carousel on Android, iOS, and Web. Minor compat fixes: - getPrivacyTokens: added optional senderTs param (master caller passes 2 args) - messageMutex.mutex: added mutexKey param (master signature requires it) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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