Module types 

v1 (APRN) container type definitions — sovereign leaf (issue #2231).

Moved out of aprender-core/src/format/ (types.rs + spec.rs). Uses crate::error::AprFormatError instead of aprender_core::AprenderError; aprender-core wraps these errors via impl From<AprFormatError> for AprenderError and re-exports the moved API so existing aprender_core:: format::* paths keep working unchanged.

Byte-identity (issue #2231): the field set and serde derives mirror the pre-extraction aprender-core types EXACTLY so the on-disk MessagePack metadata + bincode payload encodings are unchanged (the golden fixtures pin this for v1 F32).

Structs

DistillationInfo

Complete distillation provenance (spec §6.3.2)

DistillationParams

Distillation hyperparameters (spec §6.3.2)

Flags

Feature flags (bitmask) — spec §3.2.

Header

File header (32 bytes).

LayerMapping

Layer mapping for progressive distillation (spec §6.3.2)

LicenseInfo

Commercial license information (spec §9.1).

Metadata

Model metadata (MessagePack-encoded).

ModelInfo

Model information (from inspection).

SaveOptions

Options for saving models.

TeacherProvenance

Teacher model provenance for audit trails (spec §6.3.2)

TrainingInfo

Training information.

Enums

Compression

Compression algorithm.

DistillMethod

Distillation method used (spec §6.3.1)

LicenseTier

License tier levels (spec §9.1).

ModelType

Model type identifiers.

Constants

FORMAT_VERSION

Current v1 format version (1.0).

HEADER_SIZE

v1 header size in bytes.

MAGIC

Magic number: “APRN” in ASCII (0x4150524E).

MAX_UNCOMPRESSED_SIZE

Maximum uncompressed size (1GB safety limit — compression-bomb protection).

Functions

chrono_lite_now

Simple ISO 8601 timestamp (no chrono dependency).