Terminal restore on Ctrl-C for borg server start and borg server dashboard,
with a second-signal escape hatch (PR #298). Dashboard memory leak fixed:
Ink paint-path retention reduced ~94% under production-shaped polling
(PR #302). nanoid lockfile security refresh (GHSA-2v37-7h3g-55p8).

Prep: deterministic release:prepare from 17efae24, classified by the
fail-closed release-identity check (PR #303). Gate chain: CR/SR/RQ on
both fix slices at their exact SHAs.