Admin CLI Core

This is an internal CLI utils package, not a CLI itself. It is used by the following admin CLIs across our code bases:

• serverctl -- Server API
• usersctl -- Users API
• spinectl -- Mycelium Spine
• hyphctl -- Hyphae

Responsibilities

1. CLI Skeleton: Cobra-based CLI skeleton with default global options
2. gRPC Client: Enforce local, named Unix named socket based gRPC access
3. UI: Provide a uniform UI module that supports --format default|json|shell where: a. default shows human friendly, eye candy ladden, bubbletea based outputs b. json shows output in json format c. shell shows output in non-interactive shell format meant to be able to be piped to other commands (tsv for tables, etc)