Codex-authored docs covering primitives, commands, messaging, lifecycle, subsystems, and getting started — all using the current DTO/Options/Result API with concrete usage examples. Co-Authored-By: Virgil <virgil@lethean.io>
- Add comprehensive docs/pkg/core.md covering DI container, service pattern, message bus (ACTION/QUERY/TASK), error handling, runtime - Remove pkg/core/docs/site/ (ancient MkDocs HTML with Lethean branding) Co-Authored-By: Virgil <virgil@lethean.io>
