v0.10.0

Changed

• Represent unavailable observer transaction depth as null and deliver the
  statement notification when only that optional metadata inspection fails.
• Reject structured row-locked child queries before derived-source or IN/
  NOT IN attachment, preventing execution without the parent's transaction guard.

Fixed

• Infer QueryBuilder for untyped when() and unless() callback parameters
  in consumer static analysis without changing callback execution semantics.
• Quarantine the owner and preserve structured transaction-state evidence when
  the active-transaction check for a locking read cannot be inspected.
• Attempt statement cleanup when cursor binding or execution fails before
  handoff, preserving the original failure and cursor ownership rules.