A C# caller that leaves ChunkHash, MessageId or RecordKey null writes msgpack nil; the
reference reads it back as null, treats it as blank and answers found:false. Rust now
decodes nil as blank in content chunk requests, so those requests are answered with the
reference bytes instead of dropped. Three nil vectors from the reference server are
judged by decoding them in Rust. Record two content-plane limits in the parity scope.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
A hostile manifest of empty chunks no longer becomes a request flood: fetch_content
refuses a zero-size chunk beside other chunks, and settles the content hash and every
chunk hash (normalised, non-empty) before the first request.
Every bad chunk request is now answered found:false in the reference handler's
validation order, never refused at decode. validate_message no longer refuses content
chunk requests or responses, so a blank message id or hash, a prefix-only hash and a
negative size reach answer_content_chunk_request. The answer follows the reference's
double normalisation (handler, then CreateRecordKey), which fixes the prefix-only
hash spelling to ArgumentException on 'chunkHash'. The cs vectors gain nine
reference-server answers (blank and whitespace id, blank, whitespace and prefix-only
hash, negative size, record-key case, blank record key, double prefix) and a
metadata-order manifest; Rust answers all of them byte-identically.
Manifest metadata is Vec<(String, String)> in wire order and refuses a duplicate key,
replacing the BTreeMap that re-sorted keys.
Tests pin the surviving mutants: unusable chunk sizes, the payload-length and
claimed-size halves of the chunk check, stable sort at equal offsets, the normalised
hash and canonical key actually sent, and the kind/mime defaults never trimming.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
ContentChunkRequest/Response join CultNetMessage on the raw path, byte
identical to the reference's field order. content.rs owns normalize_hash,
pack_content, validate_manifest, answer_content_chunk_request and
fetch_content, mirroring CultMeshCdn and CultMeshLegacyRudpContentServer.
The C# vector test is added here; the vector files and Rust tests follow.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
