docs: clarify README as sample app, not an official Warp product

[warp-agent-staging]

Summary

A customer (Riot) came away from a call believing oz-workspace was an officially supported Warp product. It isn't — it's a sample app that showcases what you can build on Warp's cloud agent SDK (the Oz Agent API). The README's opening line ("Oz Workspace is an open-source collaborative AI agent workspace built with Warp's Oz API...") reads like a product pitch and never states that it's a sample or that it's unsupported, which is the likely source of the confusion.

Changes

• Added a short callout at the top of the README stating plainly that this is a sample app, not an official Warp product, with no SLA or support commitment, and pointing readers at the Warp docs for the supported SDK/API surface.
• Reworded the original opening sentence to frame the project as a sample showcasing the Oz API rather than as a standalone product.
• Left setup, project structure, scripts, and everything else in the README unchanged.

Verification

Docs-only change (no code, CONTRIBUTING.md, or LICENSE touched). Reviewed the rendered Markdown by eye; no build/test steps apply.

[warp-agent-staging]

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