docs(design): task-review spec + filed [#A] task

docs/design/task-review.org captures the brainstorm output for a daily 5-min keystroke-driven review habit that walks 7 oldest-unreviewed top-level [#A]/[#B]/[#C] tasks per session, rotating through the list over ~12 days. Replaces wrap-it-up.org's date-coverage scan once implemented; the watchdog flips from "do all priorities have dates?" to "is the review habit happening?" with a 30-day threshold.

todo.org gets a [#A] entry at the top of Rulesets Open Work pointing at the spec, so the implementation work isn't lost. Six components in the spec's Next Steps: extract task-review-staleness.sh, replace the wrap-up section, author task-review.el in archsetup, author the workflow file plus INDEX entry, add the startup nudge, smoke test.

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