feat: Redesign homepage features with two-column layout and research links

[jeremyeder]

Summary

• Convert features grid to vertical list with two-column layout (feature tile on left 45%, example on right 55%)
• Add responsive design with 768px mobile breakpoint (vertical stacking on small screens)
• Link "Research-Backed" feature to Complete Attribute Table on implementation-status.html page (#complete-attribute-table anchor)
• Add 6 unique examples using mixed approach:
  • Research-Backed: 3-row table snippet with link to full table
  • CI-Friendly: GitHub Actions badge + 3-item checklist
  • One Command Setup: Terminal command with success output
  • Language-Specific: Bulleted list of supported languages
  • Automated Infrastructure: ASCII file tree showing .github/ structure
  • Readiness Tiers: Four certification badge buttons
• Add 147 lines of CSS for .feature-list, .feature-item, .feature-tile, .feature-example classes
• Update index.md features section (130 lines changed)

Files Changed

• docs/assets/css/agentready.css - Added two-column layout CSS with responsive breakpoints
• docs/index.md - Redesigned features section with new layout and examples
• docs/implementation-status.md - New page with Complete Attribute Table
• docs/tbench.md - New Terminal-Bench evaluation dashboard page

Visual Changes

• Desktop: Horizontal two-column layout with hover effects (border color, shadow, translateX)
• Mobile: Vertical stacking for screens <768px width
• All 6 features now have unique, contextual examples on the right side
• Research-Backed now links directly to the detailed attribute table

Test Plan

• Jekyll build succeeds locally
• Desktop layout renders correctly (two columns, 45%/55% split)
• Mobile layout stacks vertically on narrow screens
• Research-Backed link anchors to Complete Attribute Table
• All 6 features display with appropriate examples
• Hover effects work (border, shadow, translation)
• Verify GitHub Pages deployment after merge
• Cross-browser testing (Chrome, Firefox, Safari)

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