Consider adding title + description token count

[dacharyc]

In a recent investigation into the antigravity-awesome-skills mega repo, I encountered an issue where loading a large number of skills would consume a large percentage of each session's context just due to the token counts of the title + description of each skill. Consider adding an informational title + description token count so skill authors are aware of this as a consideration, and can potentially tweak if it's a large token count.

Also consider making this a possible "warn" condition for a multi-skill-directory check if the title + token count exceeds a certain number, with the understanding that many users may attempt to load all skills without understanding the token cost of doing so. For orgs distributing a large number of skills, where the combined title + token count exceeds a certain threshold, they may want to provide explicit guidance to users about curating a custom selection of skills.