chore: task audit (reconcile open work, demote 2 skill designs)

I reconciled all 11 open tasks against session history and repo state and refreshed their review stamps. I corrected two stale preambles: helper-instance's shipped detection slices, and memories-sync's claim that work was pending when Phases 0-4 had already shipped. The create-documentation and research-writer skill designs drop to [#D]. Both are designed but unbuilt and wait on a real triggering task, so they shouldn't sit at [#C] against active work.

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