xGFabric end-to-end scripted demo via RD (happy path + failure cases)

Goal: produce a repeatable test/demo driving integration quality.

Work:
- Script full flow: register → list → describe → allocate → submit → state/cancel (as available).
- Cover at least one failure case (invalid sid/rid/aid/jid).
- Run via HTTPS/WSS setup (self-signed cert supported).