Records user-closed projects in the persisted server store and exposes an
enriched, deleted-project-filtered accessor.
- close() records the worktree; open() drops it; internal (non-user) removals
use a new remove() so sandbox/worktree normalization does not pollute history.
- Store retains more history than is shown so display-filtered entries cannot
evict still-visible ones; consumers filter against the live project list and
cap the visible count (RECENTLY_CLOSED_DISPLAY_LIMIT).
- Matching/dedup uses pathKey to avoid false negatives from path formatting.
usrnk1
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