Initial commit: ClawSync v0.1.0

8-crate pure-Rust workspace for revision-aware HDF5 sync.

## Crates
- clawhdf5-onion: ClawOnion VFD — page-level versioned HDF5 storage,
  binary format, writer/reader, branch DAG, GC, snapshots, provenance
- clawsync-core: BLAKE3, xxHash3, FastCDC (+ SIMD NEON), zstd/lz4
- clawsync-onion: IBLT sketch, Merkle tree differ, packet differ/merger,
  ClawSyncManifest, SyncSelector
- clawsync-hdf5: dataset-level manifest, differ, patcher, wire payload
  reconstruction (apply_received_payloads)
- clawsync-transport: TCP, QUIC (quinn 0.11/TLS 1.3), SyncPeer abstraction,
  length-prefixed rkyv wire protocol (21 SyncMessage variants)
- clawsync-agent: OnionMemory, SyncScheduler, TcpSyncBackend,
  PeerCapabilities negotiation
- clawsync-fs: CDC-based delta sync for any file type; FsSyncClient/Server,
  W=16 pipelining, atomic writes
- clawsync-cli: push/pull/serve/hdf5-sync/serve-hdf5/sync/serve-fs +
  all local management commands; --quic on all network commands

## Key features
- IBLT pre-flight: O(revision count) vs rsync's O(file size)
- W=16 sliding-window push: 13–15x speedup over stop-and-wait at WAN RTT
- Dataset-granular HDF5 sync: only modified datasets transferred
- CDC delta for any file type: insertion-stable chunk boundaries
- Full revision DAG: branch, merge, rollback, export, snapshot, GC
- QUIC transport: TLS 1.3, per-message streams via quinn 0.11

## Tests
~573 passing (default features); ~589 with --features simd-cdc

## Performance (Apple Silicon)
- Reconstruct rev=100: 68 µs (target ≤ 1 ms)
- BLAKE3 Rayon 1 MB: 10.3 GiB/s (target ≥ 5 GB/s)
- GC 500 revisions: 20.6 µs (target ≤ 2 s)
- W=16 vs W=1 at 5 ms RTT: 14.8x speedup
- No-op pre-flight at 16 MB: 4 ms vs rsync 35 ms (7.8x)

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

crates/clawsync-onion/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name        = "clawsync-onion"
+description = "ClawSync onion-aware diff, layer packaging, and manifest protocol"
+version.workspace    = true
+edition.workspace    = true
+rust-version.workspace = true
+license.workspace    = true
+repository.workspace = true
+readme       = "README.md"
+keywords     = ["sync", "hdf5", "onion", "delta", "revision"]
+categories   = ["filesystem", "network-programming", "science"]
+
+[dependencies]
+clawhdf5-onion = { workspace = true }
+clawsync-core  = { workspace = true }
+
+rkyv        = { workspace = true }
+blake3      = { workspace = true }
+xxhash-rust = { workspace = true }
+thiserror   = { workspace = true }
+serde       = { version = "1", features = ["derive"] }
+
+[dev-dependencies]
+criterion = { workspace = true }
+proptest  = { workspace = true }
+tempfile  = "3"
+
+[[bench]]
+name    = "iblt_bench"
+harness = false