next-task

基于 `idea` 队列生成实现分支并打开 PR，自动化代码实现与合并。

在代码线上完成一次实现迭代：处理挂起的 PR、修复中断（红 CI/安全/人工问题），或从 idea 队列挑一个开分支实现并发起 PR，绿灯后 squash‑merge。当你想要自动推进、但不想逐条指定任务（比如说“next task”）时用。只做一件事一轮，消费 idea 队列并在通过 CI 后合并。

# Next Task — the implementation half of the loop

One invocation = one iteration:
**guard → interrupts → pick ONE queued idea → build & record**.

This skill implements; it does not invent. The idea queue is GitHub Issues
labeled `idea`, filled by the `next-idea` skill (which runs on its own
schedule — see `docs/task-automation.md`). Maintenance exists only as an
interrupt. Housekeeping — dependency bumps, TODO-comment cleanup, docs
reshuffling, refactors with no user-observable effect — **is not work**;
never fall back to it to look busy. If the queue is empty and nothing is
broken, doing nothing is the correct outcome.

The human steers by editing `IMPLEMENTATION_PLAN.md` (North Star + va