## ADDED Requirements

### Requirement: Strategies package provides all built-in packing strategies
The `@suaveplan/bitpacker-strategies` package SHALL provide `PackingStrategy` implementations for all schema tokens: number, string, boolean, null, bigint, object, array, enum, optional, oneOf, conditional, version, ref, datetime, varint, map, set, bitarray, blob, bitset.

#### Scenario: String strategy handles fixed and variable length
- **WHEN** a schema is `"8"` (fixed) or `"-8"` (variable)
- **THEN** the strategy packs and unpacks strings correctly for both formats

#### Scenario: Enum strategy packs index with minimum bits
- **WHEN** a schema is `{ _enum: ["a", "b", "c"] }`
- **THEN** the packed value uses exactly 2 bits for the index

#### Scenario: Optional strategy uses presence bit
- **WHEN** a schema is `{ _optional: 255 }` and the value is `undefined`
- **THEN** only a single 0 bit is written

### Requirement: Strategies package exposes a default registration function
The `@suaveplan/bitpacker-strategies` package SHALL expose `registerDefaultStrategies(manager)` that adds all built-in strategies to a `PackingStrategyManager` in the correct order.

#### Scenario: Default strategies cover all primitive schemas
- **WHEN** `registerDefaultStrategies` is called on a manager
- **THEN** every primitive schema token has a matching strategy

## MODIFIED Requirements

None.

## REMOVED Requirements

None.