feat(workflows): SUPERSEDED/CANCELLED decision states + old-model gate

A superseded decision now flips to SUPERSEDED (linking its replacement) and a moot one to CANCELLED. Both are done-class via a #+TODO: header the spec template auto-adds, so the [/] cookie counts them resolved and neither blocks implementation-ready. The TODO/DONE pair alone had lost the old State: field's superseded value.

spec-review's gate and Ready rubric now read "no decision is still TODO", and a spec still on the retired State: field model fails the gate item until converted. The gate as first written would have vacuously passed old specs, which have no decision tasks at all.

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