Release v0.13.2

A small patch release.

Fixed

• Custom nodes that output date/time columns now preview correctly. Running
  a custom node whose output contained a Date, Datetime, Time, Duration,
  Decimal, or binary column through the node Test panel (dry run) failed
  with Object of type date is not JSON serializable. The worker now serializes
  these values safely (temporal → ISO string, duration → seconds, decimal →
  string, binary → hex), including when they're nested inside Struct/List
  cells. Real flow runs were unaffected — this only impacted the dry-run preview.

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Full changelog: v0.13.1...v0.13.2