* feat(#2513): Phase 5 — Kimi variant install-time disambiguation (descriptions + mismatch warning) * fix #2513: use helpers.cleanup (Windows-EBUSY retry budget) not raw fs.rmSync * fix #2513: spawnSync captures stderr (execFileSync drops it on exit-0) * docs(changeset): backfill PR #2535 for Phase 5 (#2513)