docs: add Docs MCP health check fallback

[MuncleUscles]

Summary

• Adds a small health-check callout for the hosted GenLayer Docs MCP server.
• Tells builders/agents how to recognize hosted endpoint outages and which docs/skills sources to use as a fallback.

Sanitized evidence basis

• Recent developer-facing setup guidance points agents directly at the hosted Docs MCP endpoint without a verification or fallback path.
• A recent internal report flagged the Docs MCP endpoint as unhealthy; a read-only check during this run returned HTTP 502 for the hosted SSE and well-known endpoints.

Test plan

• pnpm build — passed.

Note: Created by weekly docs-and-skills gap loop; draft for human review.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/weekly-docs-gap-2026-06-15-docs-mcp-health

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