Drives the Head of Marketing calling propose_feature_spotlight through the real
do_server -> /api/v1/do route -> ContentActions -> XEngine, then asserts a held
x_feature draft is created (confirmed_by_human=False) and the exploration task
completes. Red-then-green verified: reverting the do_server registration
(3f90d382) makes this fail with the exact live symptom. This is the e2e coverage
the wiring gap should have had (standing rule: gaps become e2e smoke).
