feat(review): add keyless OmniRoute free-gateway provider to the OpenCode review pool

[seonghobae]

Problem

The central OpenCode review pool depends on provider keys / free tiers that can lapse — GitHub Models retirement (2026-07-30), or unset OPENAI_API_KEY / OPENROUTER_API_KEY. When they all lapse the pool reports OPENCODE_MODEL_POOL_OUTCOME: exhausted, so no PR org-wide can produce opencode-review approval evidence and the whole queue freezes.

Fix — a keyless recovery path

Add OmniRoute (the org's free OpenAI-compatible gateway, ContextualWisdomLab/OmniRoute) as a keyless provider in the OpenCode review model pool, so the pool has a working model with no per-provider secret required.

• enabled_providers gains "omniroute"; a new "omniroute" provider block (@ai-sdk/openai-compatible, model auto, tool_call: true, 200000/32768 limit) resolves its base URL from the org variable OMNIROUTE_API_BASE_URL and an optional OMNIROUTE_API_KEY secret — keyless by default, never a hardcoded endpoint.
• omniroute/auto is appended to the public-only segment of OPENCODE_MODEL_CANDIDATES (never the private-repo segment). A free gateway with best-effort upstreams must not see private-repo code — this matches the existing opencode-free gating.
• run_opencode_review_model_pool.sh skips omniroute candidates when OMNIROUTE_API_BASE_URL is unset (fail-safe fall-through) and caps its runtime with the bounded free-provider failover window.
• Contract tests updated to pin the new provider, candidate, env wiring, and skip behavior.

Activation (org-side, not code)

1. Set vars.OMNIROUTE_API_BASE_URL to the OmniRoute deployment (the Fly app omniroute).
2. OmniRoute should front at least one tool-calling-capable upstream so the reviewer can emit a structured verdict (the raw reverse-engineered keyless upstreams alone cannot reliably tool-call).
3. OMNIROUTE_API_KEY is optional — set it only if your deployment requires a caller token.

This is an independent, keyless alternative to the keyed NVIDIA NIM path in #672; either can restore the pool. Like any change to .github, it only takes effect once merged to main.

Why it's safe

Additive, fail-safe, and public-repo-gated. If the base URL var is unset the provider is skipped and the pool falls through unchanged — it cannot break an existing pipeline.

Verification

• coverage run -m pytest tests → 712 passed, coverage report → 100% (fail_under=100).
• interrogate → 100.0%.
• bash scripts/ci/test_strix_quick_gate.sh → PASS.

🤖 Generated with Claude Code

https://claude.ai/code/session_016wtuYFp4E22QnEU1bFMhsr

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 83c28870-4b1b-454b-84d5-d8f313ab0b2a

📥 Commits

Reviewing files that changed from the base of the PR and between 32973e9 and 22d367b.

📒 Files selected for processing (5)

• .github/workflows/opencode-review-dispatch.yml
• scripts/ci/run_opencode_review_model_pool.sh
• scripts/ci/test_strix_quick_gate.sh
• tests/test_opencode_agent_contract.py
• tests/test_opencode_model_pool_runner.py

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