* fix(worktrees): remove repeated scans and keep prepared checkouts fresh
* fix(worktrees): reclaim unlocked fallback preparations safely
* refactor(worktrees): simplify creation ownership and idle maintenance
* fix(git): keep ref maintenance armed after an index-only pass
An idle attempt that found the pack index due but refs still cooling down
returned without rescheduling, so loose refs from the arming fetch waited
for the next write instead of the ref cooldown.
* Stop obsolete worktree preparations when evicted or expired
* Let worktree preparation proceed during stale reclamation
* Verify creation during stalled stale worktree reclamation
* Preserve preparation ownership until Git removal starts
* test: keep artifact share fixtures unexpired across calendar dates (#18955)
* perf(worktree): overlap base refresh with prepared checkout
The speculative warm-up that runs while the create composer is open resolved
refs and fetched with host Git even when the project's runtime is a WSL distro,
while both the checkout preparation it feeds (`prepareWorktreeCreateForRepo`,
which already resolves `{ wslDistro }` itself) and the real create path run
inside the distro.
The concrete cost was a discarded fetch: `getCanonicalFetchKey` namespaces the
runtime's remote-fetch cache `wsl:<distro>` vs `local`, so the warm-up's fetch
landed in a namespace create never looks at, and create fetched again. On a
Windows host with no usable host-side Git the probes also failed outright, so
that cohort got no warm-up at all.
Thread the project's worktree Git options through the prefetch (resolved by a
non-throwing helper, because an optimistic warm-up must not surface a
repair-required runtime as a failure) so every probe and fetch runs where create
runs. `gitOptions` is a required argument, so a caller cannot drop the routing
silently. Host-routed calls keep their original arity, so macOS, Linux,
native-Windows-host projects, SSH repos and folder workspaces are unchanged.
Narrower than it looks: for a repo under \\wsl.localhost\<distro>\... the probes
were already routed by cwd, and for a repo on a Windows drive letter host Git
and WSL Git read the same on-disk repository, so the answers were already
correct there. What those cohorts gain is a fetch create can reuse; what they
pay is that the probes now run inside the distro (over /mnt/c for drive-letter
repos, which also newly arms the linked-worktree routing probe) and the
speculative fetch now shares create's per-remote fetch queue, as it always has
on native platforms.
Also collapse the three byte-equivalent copies of `hasLocalWorktreeBaseRef`
(create, prefetch, remote-repo create) into one in
git/worktree-base-ref-probe.ts, drop the host-only `hasLocalCommitObject` that
caused the routing bug, and add the first routing assertions on the create-path
consumers of the now-shared probe.
Neil