:enew <name> creates a new file (empty, dirty, added to the palette list);
:delete unlinks the current file via a new Effect::Delete and switches to a
parked buffer or scratch. Scope is read from the path (local/x, repo/x) rather
than a modal prompt, and the /sd prefix is now optional in resolve_path.
On-device testing showed deletions never reached the remote: add_all(["*"])
alone does not stage a removal on this libgit2, so the tree came back unchanged
and the push was a silent no-op. stage_and_commit now runs add_all then
update_all(["*"]) (git add -u) — together git add -A. The :delete snackbar now
confirms the scoped file and flags that a Tracked file is local until :sync.
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