vit: scope skill to VPE ship workflow, add TRIGGER + Invoke via Bash
The talent/vit/ skill is intentionally narrow — it's the publish step
that runs at the end of a VPE playbook when a feature lands through
hopper. Discovery and consumption commands (skim, follow, learn, remix,
vet) are covered by the user-wide `using-vit` skill; duplicating them
here would create activation-ambiguity between two skills.
Make the scope explicit in description, body, and a dedicated Scope
note. Add a structured TRIGGER (was previously inline "Activates when..."
prose) with literal ship-workflow phrases. Add Invoke via Bash line.
Replace the "other commands" section with a pre-ship-diagnostics
section + pointer to using-vit.
Part of skills audit req_loq3e2lk pass 1+2. The audit suggested promoting
skim/follow/learn to peer sections; rejected here because that would
duplicate using-vit and split activation unpredictably. Scope note in
the synthesis plan to address this.