docs: complete TrustGraph.ai-style documentation restructure
New docs/ layout:
- src/index.md - Landing page
- src/getting-started/ - Installation, first node, concepts
- src/architecture/ - L0-L4 stack documentation
- src/for-agents/ - AI-focused docs (Day Zero, RFC-0290, emergence)
- src/tutorials/ - 3 hands-on tutorials (hello-world, chat, agent-bridge)
- src/rfcs/ - All RFC specifications
- mkdocs.yml - Site configuration
Old docs archived to docs/archive/
Total: ~4,000 lines new documentation
Built by 3 parallel subagents:
3d00e1a38e