* fix: skip re-importing packages when global virtual store is warm
When node_modules is deleted but the global virtual store directories
survive, pnpm previously re-fetched every package because the skip
logic required currentLockfile to be present. Add a fast-path that
checks pathExists(dir) for GVS directories even when currentLockfile
is missing, since the GVS directory hash encodes engine, integrity,
and full dependency subgraph.
* fix: remove includeUnchangedDeps guard from GVS fast-path
The includeUnchangedDeps flag is true whenever currentHoistPattern
differs from the desired hoistPattern. After deleting node_modules,
currentHoistPattern is always undefined (read from .modules.yaml),
so the flag is always true when hoisting is configured — defeating
the optimization in the exact scenario it targets.
The guard is unnecessary because the fast-path only skips fetch/import
(fetchResponse = {}), not graph inclusion. The package is still added
to the graph with children populated, so hoisting recalculation works.
* perf: add GVS warm reinstall benchmark scenario
Adds benchmark 6: frozen lockfile reinstall with a warm global virtual
store after deleting node_modules. This measures the reattach fast-path
where all packages are skipped (no fetch/import) because their GVS
hash directories already exist.
* fix: use proper types in fetchPackage spy to pass tsgo strict checks
