ci(strix): add same-provider NIM Nemotron fallbacks before GitHub Models

[seonghobae]

Created accidentally during connector discovery. No project work is tracked here; the active source-repository ruleset incident remains #732.

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📥 Commits

Reviewing files that changed from the base of the PR and between 3f65dbe and 133d791.

📒 Files selected for processing (5)

• .github/workflows/strix.yml
• scripts/ci/test_strix_quick_gate.sh
• tests/conftest.py
• tests/test_required_workflow_queue_contract.py
• tests/test_strix_workflow_shell_contract.py

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[seonghobae]

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[seonghobae]

Closing as superseded by #734. The same-provider NIM fallback chain is now present on #734 head 269456cfe749385f85e1928f3ebd30252d556504, combined with attempt-scoped crash-debris classification and a fail-closed wrapper that preserves provider exhaustion as incomplete security evidence.