Module reconstruction 

K-of-N shard reassembly with manifest verification.

Pure domain logic — no I/O, no file system, no async runtime.

Functions

arrange_shards

Reorder extracted shard data into shard slots based on embedded index.

count_present

Count how many shards are present (non-None) in a slot array.

deserialize_shard

Deserialize a shard from binary produced by serialize_shard.

serialize_shard

Serialize a shard to binary: [index:1][total:1][hmac:32][data_len:4][data:N].

validate_shard_count

Validate that enough shards are present for reconstruction.