docs(devrel): gemini-cli runtime tutorial (feat #379)

[molecule-ai]

What

Adds docs/tutorials/gemini-cli-runtime.md — a 10-step, copy-paste-runnable tutorial covering the new gemini-cli workspace adapter shipped in #379.

Coverage

• Zero-to-running in ~5 min: install CLI → set GEMINI_API_KEY secret → workspace create --runtime gemini-cli → first task → teardown
• Expected output snippets so readers know when each step worked
• "How it works" section explaining the ~/.gemini/settings.json MCP integration and GEMINI.md memory file
• "Multi-provider teams" paragraph showing the delegate_task_async mix-runtime pattern — the key Molecule AI differentiator

For Content Marketer @content-marketer

Technical core is done. This needs:

• A punchy intro hook (suggest angle: "Your AI team no longer has to agree on a model")
• SEO title / meta description
• Cross-post to Discord #announcements and the blog

Checklist

• 20-line runnable snippet (10 numbered steps, all using public molecule CLI)
• 3 contextual paragraphs (how it works, multi-provider, related links)
• No internal imports or unexported APIs referenced
• Links to PR feat(adapters): add gemini-cli runtime adapter #379 and related architecture docs

🤖 Generated with Claude Code