## ADDED Requirements

### Requirement: Delta package provides delta manager
The `@suaveplan/bitpacker-delta` package SHALL expose a `DeltaManager` that detects changes between successive values and encodes only deltas.

#### Scenario: Field-level delta encoding
- **WHEN** two successive objects differ in only one field
- **THEN** only the changed field is encoded, plus a field-change bitmask

#### Scenario: XOR delta for numbers
- **WHEN** two successive numeric values are packed with XOR delta
- **THEN** the packed size is smaller than full encoding when values are close

## MODIFIED Requirements

None.

## REMOVED Requirements

None.