v2.2.1

[2.2.1] - 2026-08-14

Changed

• Removed further allocation-heavy BitConverter/LINQ/array-copy patterns identified in a follow-up
  review: OPACK float/double pack and unpack in AppleTvControlLibrary (HAP layer) now read/write
  directly through the ReadOnlySpan<byte>/Span<byte> via MemoryMarshal/BinaryPrimitives
  instead of allocating a temporary array per field; MRP protobuf varint encode/decode
  (AppleTvControlLibrary.Mrp) now uses a stackalloc buffer instead of recursive per-byte
  allocations; and HTTP/RTSP message formatting (AppleTvControlLibrary.Mrp) now encodes headers
  directly into the final combined buffer instead of an intermediate array. This is an internal
  efficiency pass only; no public API or wire behavior changed, and all existing tests pass
  unmodified on both net472 and net10.0.