fix(site): GLB model for GitHub Pages + gallery, journal section, Mermaid diagrams

[AndrewAltimit]

Summary

• Fix PSP 3D model on GitHub Pages -- GitHub Pages doesn't serve Git LFS files. Removed LFS tracking for .glb and stored as regular binary so the real PSP model renders instead of the procedural fallback.
• Blueprint gallery index -- blueprint.html without ?diagram= now shows a card gallery with thumbnail images of both diagrams instead of auto-loading the first one.
• README Hardware Blueprints section -- Thumbnail table with links to both interactive 3D diagrams on GitHub Pages.
• Developer's Journal section on site index -- 4 featured article cards (Media Engine RE, TLS 1.3, USB Research, Zero-Touch Dev) with links to full journal and blueprints. Added Blueprints to nav bar.
• 5 Mermaid diagram conversions across 4 journal entries -- deployment topology, CDN redirect flow, PSP streaming pipeline, frame rendering flow, dependency direction. Dark theme styling.

Test plan

• https://andrewaltimit.github.io/oasis-os/blueprint.html?diagram=psp-usb-adapter shows real PSP 3D model (not boxes)
• https://andrewaltimit.github.io/oasis-os/blueprint.html shows gallery with two clickable cards
• README Hardware Blueprints section renders with thumbnail images
• Site index Developer's Journal section shows 4 article cards
• Mermaid diagrams render in journal entries 01, 02, 03, 06
• Nav bar has Blueprints link

Generated with Claude Code

[github-actions]

Gemini AI Code Review

Issues (if any)

• [CRITICAL] site/journal/01-unified-embedded-os.html:319 - Invalid Mermaid JS import URL
  • The CDN URL contains an erroneous space (mermaid @11), causing a 404/syntax error that breaks diagram rendering.
  • Remove the space: https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs. Same error in:
    • site/journal/02-tls-on-psp.html:333
    • site/journal/03-streaming-video.html:359
    • site/journal/06-backend-trait-system.html:437

Previous Issues (for incremental reviews)

(none)

Suggestions (if any)

(none)

Notes

• The LFS tracking removal for *.glb looks correct and should allow GitHub Pages to serve the 3D model properly.
• The gallery layout in site/blueprint.html handles the missing ?diagram= parameter correctly.
• site/journal/07-psp-media-engine.html was not updated with Mermaid diagrams, but this matches the PR description which specified 5 conversions across 4 entries.

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Generated by Gemini AI (gemini-3.1-pro-preview). Supplementary to human reviews.

[AndrewAltimit]

Review Response Agent (Iteration 1)

Status: No changes needed

Fixed Issues

• (none)

Ignored Issues

• [CRITICAL] Mermaid JS import URL "erroneous space" — Gemini reported that mermaid @11 contains a space, but verification shows the actual URLs in all four files are mermaid@11 (no space). The @ is the standard npm version specifier. This is a false positive.

Deferred to Human

• (none)

Notes

• All four Mermaid import URLs (01-unified-embedded-os.html:319, 02-tls-on-psp.html:333, 03-streaming-video.html:359, 06-backend-trait-system.html:437) are correctly formatted as https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs.
• The Gemini review's other observations (LFS removal correctness, gallery parameter handling) were informational and required no action.

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The agent reviewed feedback but determined no code changes were required.