feat: add cloud voice agents and S2S model docs (t080)

[marcusquinn]

Summary

• New: cloud-voice-agents.md — comprehensive guide for deploying production voice agents using GPT-4o Realtime (OpenAI GA), MiniCPM-o 2.6 (open-weight Apache-2.0), and NVIDIA Nemotron Speech (Riva NIM composable pipeline)
• Updated: voice-ai-models.md with expanded S2S section, NVIDIA Magpie TTS and Parakeet ASR in cloud/enterprise tables, new enterprise priority row
• Updated: Cross-references in speech-to-speech.md, pipecat-opencode.md, and subagent-index.toon

What's Covered

cloud-voice-agents.md (new, 468 lines)

• Architecture overview (native S2S vs cascaded pipeline)
• Model comparison table (GPT-4o Realtime, MiniCPM-o 2.6, NVIDIA Nemotron, Gemini 2.0 Live, AWS Nova Sonic)
• GPT-4o Realtime: setup via OpenAI Agents SDK, Pipecat, and direct WebSocket; voices, pricing, GA migration notes
• MiniCPM-o 2.6: basic speech conversation, streaming mode, deployment options (HF, vLLM, llama.cpp, Ollama, int4, GGUF)
• NVIDIA Nemotron Speech: Parakeet ASR models (TDT v2 🤖 CodeRabbit AI Integration - Comprehensive Code Review Setup #1 on HF leaderboard), Magpie TTS, StudioVoice, NIM API and self-hosted setup
• Deployment patterns: browser WebRTC, phone SIP/Twilio, self-hosted privacy, hybrid cloud+local
• Cost comparison and framework selection guide
• Monitoring and observability recommendations

voice-ai-models.md (updated)

• S2S section expanded from 4 to 5 native models + new NVIDIA composable pipeline table
• Added NVIDIA Magpie TTS to cloud TTS table
• Added NVIDIA Riva Parakeet to cloud STT table
• New "Enterprise" row in priority selection guide
• Updated decision flow with enterprise/on-prem path
• Fixed MiniCPM-o version reference (4.5 → 2.6)

Task

Resolves t080: Set up cloud voice agents and S2S models (GPT-4o-Realtime, MiniCPM-o, Nemotron)

[gemini-code-assist]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/t080

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[github-actions]

🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 45 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Mon Feb 9 02:26:25 UTC 2026: Code review monitoring started
Mon Feb 9 02:26:25 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 45

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 45
• VULNERABILITIES: 0

Generated on: Mon Feb 9 02:26:28 UTC 2026

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Generated by AI DevOps Framework Code Review Monitoring

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud