refactor: strip 25 extracted packages, slim to foundation (#5)
## Summary
- Remove 25 packages extracted to domain repos (go-crypt, go-ai, go-devops, go-scm, go-netops)
- Make crypt service registration optional in CLI framework
- core/go is now a pure foundation library (~24K LOC, 17 packages)
## Remaining packages
cache, cli, config, framework, help, i18n, io, lab, log, plugin, process, ratelimit, repos, session, webview, workspace, ws
Co-authored-by: Claude <developers@lethean.io>
Reviewed-on: #5
Co-authored-by: Charon <charon@lthn.ai>
Co-committed-by: Charon <charon@lthn.ai>
Charon
fc8ebe53e1