* fix(worktrees): preserve user workspace names across branch changes
* test(worktrees): cover pinned rename metadata
* fix(workspaces): address display-name review edge cases
* fix(workspaces): keep automatic names fresh across refreshes
* fix(workspaces): preserve legacy CLI labels
* fix(workspaces): preserve display-name provenance across hosts
* fix(workspaces): honor legacy display-name provenance
* fix(workspaces): fence display-name refresh races
* fix(workspaces): accept peer renames from provenance-less hosts
The old-host preserve fence kept a pinned local label on every refresh,
which also suppressed a legitimate rename another client persisted
through the same host until app restart. Narrow it to labels the host
re-derived itself (branch short name, or path basename when detached);
any other changed label in a mode-less response is explicit meta a peer
wrote there. Stale prior-label responses stay covered by the downstream
staleness fence, in-flight writes by the pending fence.
* refactor(workspaces): unify display-name pin derivation
Three call sites (renderer optimistic update, local IPC updateMeta
handler, remote worktree.set handler) each restated the same formula;
a future edit to one would silently skew provenance between paths.