docs: tidy README header and point Tech Report at arXiv

[zhanghanduo]

Summary

• Replace the --- rule under the logo with <hr> and adjust the header spacing/badge block
• Point the Tech Report link at the arXiv page (arxiv.org/abs/2608.23283) instead of the hosted PDF

Test plan

• Visually check the rendered README header on GitHub
• Confirm the Tech Report link resolves

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR tidies the README’s top header layout by switching to an explicit HTML horizontal rule and updating the Tech Report link to the corresponding arXiv abstract page.

Changes:

• Replaced the markdown --- separator under the logo with an HTML <hr> and adjusted header spacing.
• Updated the Tech Report link from a hosted PDF URL to https://arxiv.org/abs/2608.23283.
• Added an extra header wrapper <div> around the badge/link block (needs a closing tag to avoid affecting the rest of the README).

Suppressed comments (1)

README.md:25

• The new wrapper <div align="center" style="line-height:1"> opened earlier in the header is never closed, which can cause the rest of the README to render inside that div (layout/centering issues on GitHub). Close the wrapper after the header link paragraph.

<p align="center">
  <b><a href="https://www.apodex.com/blog/apodex-1.1-scaling-agentic-intelligence-for-complex-work">Tech Blog</a></b> ·
  <b><a href="https://arxiv.org/abs/2608.23283">Tech Report</a></b>
</p>

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