feat: add OrcaRouter as an RM provider in DeepScaler

[martinzudergaming-a11y]

Summary

DeepScaler's outcome-reward-model (ORM) path currently falls back to a single OpenAI client (call_oai_rm_llm) when the Gemini ORM is unavailable. This PR adds OrcaRouter as a first-class, named RM provider so the ORM fallback can be routed through the OrcaRouter gateway.

OrcaRouter is an OpenAI-compatible AI gateway built for both models and agents. Like OpenRouter, it exposes a provider/model namespace across many models — but it also combines adaptive routing, automatic failover, zero-markup inference, observability, guardrails, and agent-tool governance behind the same endpoint. Adding OrcaRouter as a first-class provider means DeepScaler users can use that stack directly, without treating OrcaRouter as an anonymous custom base URL. It also runs gateway-level, zero-trust security for AI agents on the same endpoint — screening every prompt/response and governing every tool call on a default-deny basis, with no application code changes.

Design

The new provider mirrors the existing OpenAI RM wiring exactly, staying fully parallel to call_oai_rm_llm:

• gad/deepscaler/globals.py — adds ORCAROUTER_API_BASE and ORCAROUTER_RM_MODEL, the same way OAI_RM_MODEL already configures the OpenAI RM. Key is read from the ORCAROUTER_API_KEY environment variable, parallel to how call_oai_rm_llm relies on OPENAI_API_KEY.
• gad/deepscaler/utils.py — adds call_orcarouter_rm_llm, a byte-for-byte structural copy of call_oai_rm_llm (same retry/backoff, same chat.completions.create payload) that points at https://api.orcarouter.ai/v1.
• gad/deepscaler/rewards/math_reward.py and gad/deepscaler/rewards/judge_reward.py — the ORM fallback chain becomes Gemini → OpenAI → OrcaRouter. The existing "[[YES]]" gate is preserved, and each fallback now guards against a non-string return before substring-matching.

No dependency is added — the code uses the openai package already required by DeepScaler.

Verification

• python -m py_compile passes on all four modified files.
• All four modules import cleanly with PYTHONPATH=gad.
• Live-tested call_orcarouter_rm_llm against https://api.orcarouter.ai/v1 with the ORCAROUTER_API_KEY environment variable — returned a valid completion ([[YES]]).
• Unit-style behavior test confirms the fallback chain reaches OrcaRouter only when Gemini and OpenAI both fail, and that OrcaRouter is never called when an earlier provider succeeds.

I'm an engineer on the OrcaRouter team.

Discord: discord.gg/YEubt8enRA · X: https://x.com/OrcaRouter

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