Fix Murf integration serving Gen2 instead of falcon-2

[coval-cale]

Murf's us-east host ignores the model param and always serves Gen2, so the provider now uses the global endpoint with the recommended Amara/Gordon voice pool.

Greptile Summary

The PR updates the Murf TTS integration to use Murf's global WebSocket endpoint and replaces Natalie with Amara in the recommended two-voice pool.

• Routes falcon-2 synthesis through global.api.murf.ai.
• Uses Amara and Gordon for balanced benchmark voice assignment.
• Updates Murf provider tests for the new endpoint and voice.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failure established.

The endpoint, model, path, query structure, and WebSocket frame protocol remain internally consistent, while the registry voice changes flow through the existing balanced assignment and result-recording paths.

_{Reviews (1): Last reviewed commit: "Fix Murf integration serving Gen2 instea..." | Re-trigger Greptile}

Context used:

• Knowledge Base — Runner Orchestration

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c86e1b38-b122-4e6f-91b0-1786d4098acc

📥 Commits

Reviewing files that changed from the base of the PR and between 0799052 and 2f8ce2c.

📒 Files selected for processing (3)

• runner/src/coval_bench/providers/tts/murf.py
• runner/src/coval_bench/registries/models.py
• runner/tests/providers/tts/test_murf.py

---

Walkthrough

The Murf TTS integration now uses Murf’s global streaming WebSocket endpoint. The Falcon 2 registry entry now uses Amara as its primary voice and retains Gordon as the alternate voice. Murf provider tests now use the updated voice and global endpoint hostname.

Suggested reviewers: seribaymadina

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the Murf integration issue and the intended Falcon 2 behavior.
Description check	✅ Passed	The description accurately explains the endpoint change and the recommended Amara/Gordon voice pool.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}