feat(triage): replace OpenAI LLM calls with Gemini

[duncanleo]

Summary

• Replace OpenAI Responses API usage in triage LLM functions with Gemini @google/genai calls.
• Add Gemini-specific structured JSON/tool-call adapter and usage logging.
• Switch runtime configuration and workflows from OPENAI_API_KEY to GEMINI_API_KEY.
• Use gemini-3-flash-preview for triage/extraction and gemini-3.1-flash-lite for title/translation.
• Keep the package-boundary check usable while deleted tracked files are unstaged.

Validation

• npm run build:triage
• npm run test:triage
• npm run check

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch duncanleo/switch-to-gemini

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