[Eigenwise]

Summary

Add an Atomic Agents installation page and a sidebar entry, as discussed in #21461.

The page uses shared onboarding content from PostHog/posthog#123042. That source must merge first. It includes the setup-level callout Marco requested: Atomic Agents 2.15.0 does not send generation input/output messages.

The example uses Atomic Agents' built-in GenAI spans with the OTLP HTTP exporter. The companion PostHog/context-mill#440 adds the guide to the setup agent. Merge it after the docs URL is live.

Checks

• Formatted the new MDX stub with Prettier.
• Compiled the shared source and executed its step function.
• Ran the exact Python snippets with real Instructor/OpenAI clients, mocked completion HTTP responses, and captured OTLP protobuf exports.
• Verified agent/LLM parentage, model and usage attributes, hidden payloads, and missing generation messages.
• No live inference or PostHog ingestion was tested.

Draft: pnpm start, page rendering, console checks, and narrow/wide light/dark navigation screenshots have not been run. This is not ready for merge. Merge the shared source first, then the website change. Merge the setup-agent PR after the docs URL is live.

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