Agent Skills: ticket-verify

V-phase skill for the ticket-writing workflow. Self-reviews the drafted ticket against the severity ladder (Critical/High/Medium/Low); dispatches the ticket-reviewer subagent for fresh-context review on feature/exploration/infrastructure tags (no dispatch for bug/hotfix/chore). Resolves findings inline — self-evident fixes apply directly, ambiguous fixes go through user approval per finding, structural findings loop back to an earlier phase. After approved fixes, surfaces the draft→ready gate as the final user checkpoint.