New structure: docs/ split into 11 subdirectories (getting-started/,
agents/, providers/, sidecar/, multi-machine/, plugins/, config/,
production/, architecture/, contributing/, pro/).
New files:
- docs/README.md: navigation index with audience table
- docs/getting-started/quickstart.md: install, build, first session
- docs/config/ref-settings.md: all env vars, config files, databases
- docs/architecture/overview.md: split from architecture.md (>300 lines)
- docs/pro/README.md: Pro edition overview
- docs/pro/features/analytics.md: analytics dashboard docs
- docs/pro/features/cost-intelligence.md: budget + router docs
Remaining docs being written by background agents — will be committed
in follow-up when complete.
