Users were typing skill names (e.g. 'caveman', 'find-skills') directly in
the REPL and getting LLM responses instead of skill invocation. Only
'/skills <name>' triggered dispatch; bare names fell through to run_turn.
Fix: after slash-command parse returns None (bare text), check if the first
token looks like a skill name (alphanumeric/dash/underscore, no slash).
If resolve_skill_invocation() confirms the skill exists, dispatch the full
input as a skill prompt. Unknown words fall through unchanged.
156 CLI tests pass, fmt clean.
8d0308eecb