Add Murf falcon-2 TTS provider

[coval-cale]

Registers Murf's Falcon 2 streaming model as pending, synthesized over their stream-input WebSocket, until MURFAI_API_KEY is mounted in infra.

Greptile Summary

Adds a pending Murf Falcon 2 TTS integration using Murf's stream-input WebSocket API.

• Registers the provider, model, API-key configuration, and environment mapping.
• Implements base64 PCM streaming, error handling, and TTFA capture.
• Adds unit coverage for requests, responses, validation, errors, and timing.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or independently actionable non-blocking issue identified.

The provider registration, configuration wiring, constructor path, result contract, and pending-model status are internally consistent, while the tests cover the principal implemented success and failure paths.

_{Reviews (1): Last reviewed commit: "Add Murf falcon-2 TTS provider" | Re-trigger Greptile}

Context used:

• Knowledge Base — Runner Orchestration

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
benchmarks	Ready	Preview	Aug 5, 2026 8:01pm

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4af27939-9f40-49b4-823e-615026312821

📥 Commits

Reviewing files that changed from the base of the PR and between 6a9f64d and b6795e4.

📒 Files selected for processing (7)

• .env.example
• runner/src/coval_bench/config.py
• runner/src/coval_bench/providers/tts/__init__.py
• runner/src/coval_bench/providers/tts/murf.py
• runner/src/coval_bench/registries/models.py
• runner/src/coval_bench/registries/provider_keys.py
• runner/tests/providers/tts/test_murf.py

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