cs-issue-fix 是做什么的?
Issue workflow Stage 3 — Perform targeted fixes based on the confirmed root cause and solution, verify the changes, and write {slug}-fix-note.md for documentation. Two entry points: the standard path comes from analyze, and the express path comes directly from report. Triggers: user says "start fixing bug", "fix according to analysis", "modify code". Only touches files declared in the solution plan; no opportunistic optimization.