fix(opencode): bind NVIDIA_NIM_API_KEY for NIM model pool

[seonghobae]

Summary

Org secret is NVIDIA_NIM_API_KEY, not NVIDIA_API_KEY. Without this mapping every nvidia-nim/* candidate was skipped.

• Workflow: NVIDIA_API_KEY: ${{ secrets.NVIDIA_NIM_API_KEY || secrets.NVIDIA_API_KEY }}
• Pool runner: normalize NVIDIA_NIM_API_KEY → NVIDIA_API_KEY before skip checks
• Quick-gate asserts for both

Verification

• STRUCTURAL_AND_RUNTIME_PASS with only NVIDIA_NIM_API_KEY set
• Skip path does not fire for nvidia-nim/*

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📥 Commits

Reviewing files that changed from the base of the PR and between 6c5f92a and 92d9510.

📒 Files selected for processing (4)

• .github/workflows/opencode-review-dispatch.yml
• docs/nvidia-nim-opencode-hotfix.md
• scripts/ci/run_opencode_review_model_pool.sh
• scripts/ci/test_strix_quick_gate.sh

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