fix: CLI surface polish — bug fix, empty states, operator terminology
Fix undefined beacon variable in vouch.js cap vouch record (ship-blocker).
Enrich all empty-state messages with contextual guidance and next steps.
Replace "user" with "operator" in all agent-facing console output.
Only show skim hint/separator when there are actual results.
Add not-found hints with follow/explore guidance in vet, remix, vouch, learn.
Implements cpo/specs/in-flight/vit-cli-surface-polish.md — all 15 acceptance
criteria passing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>