v0.1.2

Other

• Add USB Ethernet devices (ECM, NCM, RNDIS) and pktkit integration
• Let class helpers share a taken device and discover every interface
• Add class-helper examples and document the new features
• Add the uvc feature: video descriptors, controls and frame streaming
• Fix redundant doc links in the serial module
• Add the serial feature: CDC-ACM and FTDI behind one SerialPort
• Add the msc feature: bulk-only transport, SCSI commands, block device
• Add the hid feature: HID interfaces, report descriptor parser, report I/O

Added

• Class helpers, each behind its own opt-in feature:
  • hid: HidDevice (report I/O with hidapi's report-ID conventions,
    GET/SET_REPORT, idle and protocol requests) and ReportDescriptor, a
    report descriptor parser that yields every field's offset, size,
    usages and logical range.
  • msc: MassStorage, SCSI over the bulk-only transport with stall and
    reset recovery, sense decoding and UNIT ATTENTION retries, and
    BlockDevice, a Read + Write + Seek view of a logical unit.
  • serial: SerialPort for CDC-ACM devices and FTDI chips, with line
    settings, flow control, modem lines and status, break, purging,
    std::io::Read/Write, and FTDI chip detection, baud divisors, latency
    timer and bit modes.
  • uvc: Camera with format/frame/control descriptors and unit controls,
    and Stream, which negotiates, streams over isochronous or bulk
    endpoints and reassembles frames.
• net feature: NetDevice drives CDC-ECM, CDC-NCM (16-bit transfer
  blocks) and RNDIS functions, with a non-blocking send path, a receive
  callback or queue, link state and counters; net::interfaces lists a
  device's network functions.
• pktkit feature: NetDevice implements pktkit::L2Device. This is the
  only feature that adds a dependency.
• DeviceHandle::claim_all_interfaces takes a whole device (detaching every
  kernel driver) so several class helpers can run on it; helpers lease
  their interfaces exclusively and borrow the handle's claims when present.
  DeviceHandle::is_claimed reports a claim.
• Discovery for composite devices: hid::interfaces, msc::interfaces,
  serial::ports, uvc::interfaces, plus HidDevice::open_all,
  SerialPort::open_all and SerialPort::open_interface (CDC-ACM or FTDI,
  detected).
• hid_dump, msc_info, serial_monitor and uvc_capture examples, and a
  class-helper hardware test suite driven by environment variables.