Feature request: display Agent Skills on splash screen and in chat side-bar

[smoyer64]

Sometimes after creating a new skill, it's hard to tell whether the skill didn't get discovered (or parsed due to a validation issue) or whether crush simply ignored the skill for the current prompt. I'd like the Agent Skills to be displayed in the splash screen and chat side-bar in a manner similar to LSPs and MCPs. Something like:

And:

To further aid with Agent Skills development, the validation status of a skill should be indicated using the color of the associated "LED" and warning/invalid skills should have a log entry describing the problem. Note that skills with warnings can still load and be used by the agent. Using a few test skills, the skills block would look like this in the TUI:

If others want this feature, feel free to assign it to me.