chore(tasks): close the ribbon reseat and review seven stale tasksHEADmain

I reseated the velox input-cover ribbon on 08-15 and never marked the task,
so I closed it on the verification it already carried and left the
HandlePowerKey shield in place. The review batch regraded the left-drag
gesture assessment and the per-channel audio controls from B to C, pointed
the boot-failure retrospective's /boot assertion at the topgrade spec's
kernel gate, and kept the other four as graded.

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