End-to-End Research Demo

#Learning Objectives

• Wire the auto-research loop end to end: hypothesis seed, experiment runner, scheduler, critic loop, paper writer.
• Compose the primitives from the four earlier Track D lessons through plain Python imports, not a framework.
• Run the loop to a self-terminating end and emit a single demo report that lists every stage's output.
• Keep the demo deterministic so the test suite can assert the final shape.
• Surface a clear failure mode when any stage's contract breaks, so the next stage does not run with a broken input.