Support nested prompts directories

[jsit]

Both Claude and Cursor support the "Agent Skills" spec, which calls for skills (or "prompts" in CodeCompanion lingo) to be in individual directories like this:

.
|-- skill-name
|   `-- SKILL.md
|-- another-skill
    `-- SKILL.md

I don't expect CodeCompanion to explicitly support this spec, but it doesn't seem possible to configure the Markdown prompt_library to crawl an entire directory for filenames matching a specific pattern. A codebase might include .claude/skills/my-skill/SKILL.md, for instance, and there's no way to let CodeCompanion know about it (without hard-coding the my-skill directory).

[olimorris]

Great point. I'll put this on the roadmap