Fix All: Cleaned All Files

Raise seeds to prevent premature termination on medium and hard

Raise treatment reduction, lower medium/hard seeds, focus prompt strategy

Fix 1-step termination bug, fix done field in trajectory, recalibrate seeds

Fix core environment solvability: add treatment reduction, calibrate seeds and spread rates, fix hospital grader denominator

Reduce hard max_steps to 15 to prevent WebSocket timeout

Initial submission: Cascade Containment