The make_noisy_kpts test helper used noise=0.1 with GT coordinates
spread across [0, 0.85], producing a large bbox diagonal that made
even noisy predictions fall within PCK@0.2 threshold. Reduce GT
coordinate range and increase noise to 0.5 so the test correctly
verifies that noisy predictions produce PCK < 1.0.
Co-Authored-By: claude-flow <ruv@ruv.net>
ba9c88ee30