## ADDED Requirements

### Requirement: Schema package provides schema registry
The `@suaveplan/bitpacker-schema` package SHALL expose a `SchemaRegistry` that stores named schemas and resolves `_ref` tokens.

#### Scenario: Register and retrieve named schema
- **WHEN** `registry.register("player", { name: "-16", health: 255 })` is called
- **THEN** `registry.resolve("player")` returns the registered schema

### Requirement: Schema package provides validation
The `@suaveplan/bitpacker-schema` package SHALL validate that data conforms to a schema before packing.

#### Scenario: Validate data against schema
- **WHEN** `validate(data, schema)` is called with data that exceeds a numeric range
- **THEN** a `BitpackerError` is thrown with code `VALUE_OUT_OF_RANGE`

### Requirement: Schema package supports versioning
The `@suaveplan/bitpacker-schema` package SHALL support schema versioning with forward-compatibility rules.

#### Scenario: Versioned schema migration
- **WHEN** a schema contains `{ _version: 2, _schemas: [oldSchema, newSchema] }`
- **THEN** the correct schema is selected based on the version number

## MODIFIED Requirements

None.

## REMOVED Requirements

None.