Missing doc strings for many top-level subcommands

Component

• CLI
• SDK
• Something else
• Not sure

What was the expected behaviour

All Oxide CLI commands have a doc string.

What is the current behaviour and what actions did you take to get there

Many top-level subcommands do not have a doc string, which makes autocomplete for the oxide command rather unhelpful.

$ oxide^I
api                                                                                                          -- Makes an authenticated HTTP request to the Oxide API and prints the response.                                  
auth                                                                                                         -- Login, logout, and get the status of your authentication.                                                      
completion                                                                                                   -- Generate shell completion scripts for Oxide CLI commands.                                                      
docs                                                                                                         -- Generate CLI docs in JSON format                                                                               
experimental      instance       snapshot      ip-pool      bundle       alert    disk    user   silo   vpc                                                                                                                  
internet-gateway  auth-settings  current-user  floating-ip  certificate  project  policy  image  group                                                                                                                       
system                                                                                                       --                                                                                                                
help                                                                                                         -- Print this message or the help of the given subcommand(s)                                                      
ping                                                                                                         -- Ping API                                                                                                       
utilization                                                                                                  -- Fetch resource utilization for user's current silo                                                             
version                                                                                                      -- Prints version information about the CLI.   

CLI or SDK version

0.12.0+20250604.0.0

Operating system

macOS

Anything else you would like to add?

No response

Start by searching the Rust CLI command definitions for the top-level subcommands shown in the autocomplete output, especially experimental, system, and resource commands. Compare their help metadata with commands that already display descriptions, then verify that all top-level commands show doc strings in oxide autocomplete and help output.