Use brand logomark in site header

[greynewell]

Summary

• Replaces generic Lucide layers icon with the actual Supermodel eye/diamond logomark SVG in _header.html
• SVG uses fill="currentColor" to inherit text color and hover state
• Matches the change from Use brand logomark in site header supermodeltools.github.io#1

This ensures all architecture docs pages across all sub-repos display the brand logomark instead of the generic layers icon.

Test plan

• Verify logo renders correctly on generated architecture pages
• Confirm hover color transition works (inherits from .site-brand:hover)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Style
  • Updated the header icon with a larger, refined design for improved visual prominence.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The header SVG icon has been updated in the template, replacing a small 24x24 graphic composed of multiple paths with a larger 90x78 SVG featuring a single consolidated path and explicit XML namespace declaration.

Changes

Cohort / File(s)	Summary
Header Icon Update templates/_header.html	SVG icon replaced: upgraded from small 24x24 multi-path graphic to larger 90x78 single-path design with explicit XML namespace. Visual-only change; surrounding markup and site name rendering unaffected.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

📐 An icon grew from tiny to grand,
90 by 78, now taking its stand,
Paths consolidated with namespace flair,
A header refresh in the crisp header air! ✨

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/use-brand-logomark

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