- Snapshot model parity (kinds 30070/30071/30072): gzip chunking via
platform CompressionStream, chunk-hash verification, reassembly of
Python-produced chunks, manifest JSON schema, manifest id
HMAC-SHA256(key_index, 'manifest|'+nonce) with the key_index HKDF chain.
- Full merge_index_payloads port (modified_ts_hash_tombstone_v2):
Python-compatible canonical JSON (sort_keys + ensure_ascii) for hash
parity, equal-ts field-level union, tombstone create/prefer/apply/cap,
_sync_meta bookkeeping. Populated _system.index0 content refuses to merge
loudly (atlas-milestone work) instead of silently dropping data.
- Delta replay: encrypted V3 deltas decrypt and merge in order with
source_tag = sha256(payload)[:16]; final state matches Python.
- New fixtures: nostr_snapshot.json, sync_merge.json (8 scenarios),
delta_replay.json; generator remains byte-deterministic.
- 117 parity tests green in Node and jsdom.
Co-Authored-By: Claude Fable 5 <[email protected]>
