docs(todo): task-review pass over the oldest-unreviewed batch

Seven tasks walked. Three carried a topic tag but no type tag, so they were
invisible to any filter that asks what kind of work they are.

The net/bt realtime-lamp retrofit gains :solo:. Its scope question was settled
in July, and what remains is buildable and testable without a decision.

Priorities held on review. The zsh PATH gap and the zfs base-image failure both
already sit where the severity-by-frequency read puts them, and the keybinding
family still turns on a design choice nobody has made.

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