Archive blog section proposal and update main specs.
Specs created:
- openspec/specs/blog-content/
- openspec/specs/blog-templates/
Archived to: openspec/changes/archive/2025-10-31-add-blog-section/
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
