v0.69.0

Fixed

• The hub now damps a takeover oscillation: two waiters launched for the same
  identity each take the name back from the other about once per cooldown, an
  eviction war the short cooldown only rate-limited rather than ended. When one name
  is taken over more than takeover_oscillation_threshold times within
  takeover_oscillation_window seconds, the hub quarantines it — pinning the current
  owner and refusing further takeovers for takeover_quarantine seconds, logged once
  as takeover quarantine … reason=oscillation instead of a per-second stream. The
  live owner stays connected (messages keep arriving) instead of being evicted ~1 Hz.
  New SynapseHub knobs default to 5 takeovers / 30 s → 60 s quarantine; see
  troubleshooting. 100% line+branch on hub_clients.