Polygres CLI 0.3.0

Added

• Added polygres rows validate, insert, upsert, and ignore for one JSON
  object from a file or standard input.
• Added explicit pgContext reconciliation with generated or supplied resume
  keys, default durable-operation waiting, and --no-wait support.

Changed

• Row mutations never automatically retry after authentication, transport, or
  server uncertainty. Ambiguous outcomes use stable exit code 8.