v0.6.4

Fixed

• Prevent hourly owner eviction using durable activity on one empty maintenance
  session. The previous plugin-list heartbeat did not refresh OpenCode's session
  inactivity timer. Keepalive never prompts a model or modifies a work session.
• Bound SDK waits independently of adapters that ignore AbortSignal, allowing
  shutdown to release locks without interrupting a healthy worktree session.
  A replacement dispatcher reconciles the saved session before publication.
• Wait briefly for a retiring owner's locks, bound RPC disposal, and reject
  queued checkpoint writes after shutdown to prevent failed plugin reloads.