v0.1.0

Added

• Initial Field<T> API for recoverable field-level Serde deserialization.
• FieldDecode and ScalarFieldDecode extension traits for custom recoverable decoders.
• FieldError equality based on the displayed error message, independent of internal storage.
• Optional json feature with owned and borrowed raw JSON capture through JsonField<T> and BorrowedJsonField<'de, T>.
• std and alloc feature split for no_std-compatible consumers with an allocator.