plan

Turn a finalized spec into a step-by-step implementation plan at .ai/plans/{YYYY-MM-DD}-{slug}.md, where every task has exact file paths, exact commands, and a verification with expected output. Use when asked to "plan the implementation", "create a plan", or after a spec's open questions are resolved. Do not use while the spec still has unresolved open questions, and do not use it to design — design happens in…