Integrate Atlas / EOS Sidebar

Default AI path: the platform Atlas sidebar (EOS / Fusion PAIA) via @cognite/app-sdk. Do not embed useAtlasChat, vendor atlas-agent, or call third-party LLM APIs.

integrate-atlas-chat only if the user explicitly requires in-app chat and connectToHostApp cannot provide the sidebar (standalone app; always rejects). There is no manifest field for this.

Implement only what is needed:

1. Open — Topbar Atlas button; sendAgentLayoutMode for in-app triggers
2. Message — sendAgentMessage to inject context
3. Server — resources (app state) and actions (tools)

Step 0 — Read the app

• package.json — package manager, @cognite/app-sdk
• src/App.tsx — structure, existing SDK usage