docs(todo): require a per-project Priority Scheme header

Every project's task list now opens with a "[Projectname] Priority Scheme" section declaring both the [#A]-[#D] semantics and the tag vocabulary. The concept already lived in the tooling (task-audit enforces a declared tag set, process-inbox checks for the scheme before filing), but nothing required the section or fixed its name, so a list could leave [#A] and its tags undefined.

The set is declared, not fixed. A project adapts the priorities and tags to its own work. The floor is that both are spelled out.

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