- Added `has_or_had_place_of_birth` slot to capture structured birth place information with historical context.
- Introduced `has_or_had_quantity` slot for capturing quantified values with units and provenance.
- Created `has_or_had_service_area` slot to define geographic service areas for heritage custodians.
- Implemented `is_or_was_approximate` slot to indicate uncertainty in values (dates, quantities).
- Added `is_or_was_asserted_by` slot to track the agent responsible for assertions.
- Introduced `Asserter` class to model agents making assertions, including types like human, automated, and AI.
- Created `Quantity` class to represent quantified values with optional units and types.
- Added enums for `AsserterTypeEnum` and `QuantityTypeEnum` to standardize types of asserters and quantities.
- Archived outdated slots and replaced them with new structured alternatives following RiC-O conventions.
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