Remove Phase class, organizational metadata blocks, and unused project fields. Update configuration
to use 'default_grants' and simplify PI usage to fallback corresponding author determination only.
BREAKING CHANGES: - Remove 'phase' and 'project' fields from configuration - Use 'default_grants'
instead of 'default_grant' - Generate only standard Dataverse citation metadata
Remove trailing comma after license dictionary assignment that was causing the license field to be
stored as a single-element tuple instead of a plain dictionary object.
Improve type annotations in Person.to_dict() and CustomEncoder class
to better reflect the actual return types. Enhance documentation for
Institution, Person, Abstract, and CustomEncoder classes with detailed
method descriptions and parameter explanations.
