Update README and add CODEOWNERS

[Kyle-Ye]

Summary

• Add Owner column to Platform Support table with linked GitHub profiles
• Add visionOS and Android platform rows
• Add footnote for simulator-only deploy support on iOS/visionOS
• Add note on how to request platform ownership
• Add Architecture section with diagram (Screenshots/Architecture/arch.png)
• Add .github/CODEOWNERS for automated code review assignment

Test plan

• Verify README renders correctly on GitHub
• Verify CODEOWNERS patterns match expected files

[augmentcode]

🤖 Augment PR Summary

Summary: This PR refreshes repo documentation and ownership metadata.

Changes:

• Extends the README platform support table with an Owner column and adds visionOS/Android entries
• Adds a simulator-only deploy footnote for iOS/visionOS and guidance on requesting platform ownership
• Introduces a new Architecture section in the README with a diagram image
• Adds .github/CODEOWNERS to auto-assign reviews for AppKit/macOS and UIKit/iOS related paths

Technical Notes: CODEOWNERS uses glob patterns to map platform-related directories/filenames to GitHub handles for review assignment.

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[augmentcode]

Review completed. 1 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

The visionOS row marks Test as ✅, but footnote [^4] states testing isn’t supported yet; consider aligning the table cell(s) with the footnote to avoid contradicting platform status.

Severity: low

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.22%. Comparing base (317a16d) to head (54c7ecd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #774       +/-   ##
===========================================
+ Coverage   13.14%   26.22%   +13.07%     
===========================================
  Files         619      649       +30     
  Lines       36740    40199     +3459     
===========================================
+ Hits         4831    10541     +5710     
+ Misses      31909    29658     -2251     

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