docs: restructure and rewrite all documentation from scratch
Consolidate 12 docs into 8, eliminating ~70% duplicate content.
Fix all broken doc links across 4 README translations.
New structure:
- docs/guide/: overview, installation (with agent-model setup), orchestration
- docs/reference/: features, configuration, cli
- docs/manifesto.md, docs/troubleshooting/ollama.md
Deleted: agent-model-matching, understanding-orchestration-system,
orchestration-guide, category-skill-guide, task-system, cli-guide,
configurations, ultrawork-manifesto, features, ollama-streaming-issue
880c5e3beb