docs(readme): add introductory "test new design" line

[strantalis]

Summary

• Add a new introductory line, test new design, at the top of README.md.
• Keep the existing project heading and CI badge unchanged.

Testing

• Not run (documentation-only change).

[greptile-apps]

Greptile Overview

Greptile Summary

Adds a single introductory line (test new design) to the very top of README.md, leaving the existing heading and CI badges as-is. This changes what users see first when viewing the project on GitHub (and anywhere else the README is rendered), because the new line is displayed above the # Workset title.

Confidence Score: 4/5

• This PR is safe to merge, but the new README intro text likely isn’t intended to ship as-is.
• Change is documentation-only and mechanically simple. The main concern is content quality: a placeholder-like first line will appear above the project title everywhere the README is rendered, which is usually unintended and worth confirming before merge.
• README.md

Important Files Changed

Filename	Overview
README.md	Adds a new first-line note (test new design) above the README title; as written it looks like a temporary placeholder and will ship to all rendered docs.

Sequence Diagram

sequenceDiagram
  participant A as Author
  participant R as README.md
  participant V as Viewer (GitHub/MkDocs)

  A->>R: Insert first line "test new design"
  R-->>V: Render README with line above title
  V-->>V: Displays note before badges/title

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[greptile-apps]

_{1 file reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

Unclear placeholder intro

The new first line (test new design) reads like a temporary note and will render above the project title on GitHub/MkDocs. If this is not intended to ship as permanent copy, it should be removed or replaced with a meaningful introductory sentence/tagline.

[strantalis]

Add tests for the new commit-copy behavior