Memoize owner process argv lookups per PID during `cleanStaleLockFiles`, and yield between lock entries so startup cleanup does not monopolize the event loop while inspecting many session locks.
This keeps lock classification semantics unchanged while avoiding repeated synchronous process-args reads for lock clusters owned by the same PID, especially the Windows PowerShell path.
Fixes#86509.
Verification:
- `git diff --check origin/main...HEAD`
- focused TSX harness against the current-main merge result: `session-lock memo regression harness passed`
Thanks @openperf.
Co-authored-by: openperf <16864032@qq.com>
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