eresearchqut / ddb-repository / 26011464888

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feat: add batchWriteItems with recursive retry and fix filter function casing

- Add batchWriteItems method to DynamoDbRepository, chunking requests to 25
  items per call and recursively retrying any UnprocessedItems
- Refactor batchGetItems to use same recursive fetchPage pattern, removing
  the manual setTimeout/exponential-backoff loop
- Update JsonPointerRepository.putDocument and deleteDocument to use
  batchWriteItems instead of Promise.all of individual putItem/deleteItem calls
- Fix BEGINS_WITH and CONTAINS filter expressions: DynamoDB requires lowercase
  function names (begins_with, contains) in FilterExpression strings
- Add chunking integration tests: >25 leaf values round-trip, overwrite, delete

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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