feat(workflows): add task-review list-hygiene habit

The new task-review.org workflow is the daily habit that retires the old date-coverage scan. It surfaces the oldest-unreviewed top-level tasks, walks them one at a time, and records each outcome — keep, re-grade, kill, mark DOING, or edit — stamping :LAST_REVIEWED: as it goes. It's a pure Claude workflow, no elisp. open-tasks.org displays the list; this one changes it.

task-review-staleness.sh gains a --list mode that emits the N oldest-unreviewed tasks (line, review date, heading), oldest first, so the workflow walks a deterministic batch instead of eyeballing todo.org. Never-reviewed and unparseable-date tasks sort oldest. Seven new bats cases cover ordering, the count limit, exclusions, and output format; count mode is unchanged.

startup.org gains the matching nudge. Phase A counts tasks unreviewed for >7 days and Phase C surfaces one line when that count is non-zero, pointing at the workflow. It lives in the template startup.org rather than the project-only startup-extras layer, so every project picks it up the same way it picks up the wrap-up health check.

The INDEX entry is added with the "task review" triggers the rename freed up.

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