docs: add per-host override spec and backlog tasks

I added a spec for a per-machine override mechanism (docs/PLAN-per-host-overrides.org). It proposes per-host stow tiers keyed on hostname, with the existing conf.d glob as the first tenant, so HiDPI scaling can differ between ratio and velox without per-app patches. It's gated on review.

I also updated the task list: added a pocketbook development backlog and a waybar timer module task, fleshed out the per-host task with a spec link, and rewrote the stale velox "pocketbook not installed" review item as a dated entry now that nothing installs it.

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