v0.5.3 — truthful instances, fleet-wide update banner

[0.5.3] — 2026-07-07

Fixed

• Truthful instances everywhere (#59) — every instance card shows its node
  NAME (not a hex id); the Server view lists stacked instances with node + port
  and its count matches reality (Eject only where it can actually target);
  per-instance status probes both directions (starting → serving, and back to
  failed when an engine dies — no more stale STARTING bars or false READY);
  the top-bar update banner now updates the whole fleet
  (/api/cluster/update-all) with an honest confirm, not just the head node.

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