Adds the pipeline-stage host kind wrapping the production stage-supervisor lifecycle
(Cold/Registering/Running/Halted per RELAY_SPEC), N3 relay calibration scenarios
(own-relay and canary-relay, real-worker and stub), relay invariant and
scenario-validation tests, and an adversarial judge test suite hunting spec/code gaps.
Expands SIM_SPEC to a three-layer failure decomposition.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
