TopicForge 0.5.4

First run of the DDS code against a live bus (Windows 11, a Python / Cyclone DDS
participant and a Rust / Dust DDS participant). It exposed four defects that
left the DDS module non-functional on Cyclone; all are fixed and tested.

Fixed

• list_participants reports the participant name and hostname on Cyclone
  (both were always null).
• Participant GUIDs were never read, so every participant collapsed onto one
  unknown entry.
• Vendors were never identified. The vendor id is now read from the GUID prefix;
  Dust DDS and RTI by default still report unknown.
• The OMG vendor-id table mapped Fast DDS and Cyclone to the wrong ids (now
  01.0F and 01.10). The Fast DDS side is verified statically only.
• ParticipantInfo.vendor also accepts rti_micro, opensplice, opendds,
  coredx, intercom and dust.
• detect_qos_mismatches never reported anything on Cyclone because policy
  class names were not normalized.
• A stopped participant never disappeared; departed participants and endpoints
  are now dropped.
• The Cyclone adapter leaked a reader per tool call and waited 2 s each; it now
  keeps one reader per builtin topic.
• peek_dds_samples on DCPSPublication / DCPSSubscription listed endpoints
  of participants that had left, and now includes the endpoint type_name.
• Example role nodes published below their rate on Windows.

Added

• examples/dds/: fourteen runnable examples (concepts and use cases), all
  passing on a live bus.
• scripts/integration/: a demo driver, twelve interop programs (Cyclone, Dust,
  Fast DDS, RTI, OpenSplice), one-command setup scripts and CI workflows. Only
  Cyclone Python and Dust Rust / Python / C have been run, on Windows.

Removed

• The docker / scenario integration rig, replaced by the demo driver.