chore: document a priority scheme and close two tasks in todo.org

I added an A/B/C/D priority scheme to the task list: what each level means, the assignment criteria, and the rule that an [#A] task needs a scheduled or deadline date so priorities stay grounded in time.

I also closed two finished tasks: the rm -rf path guard (done, with a pointer to the safe_rm_rf helper and its tests) and the touchpad toggle indicator (spec, implementation, and deploy record).

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