60-bit exam: DP rho timed out at 600s (rho baseline 7264s)
Height 60 exam: single-core Python DP rho (batch inversion, no negation map) hit the 600s exam limit unsolved; reference rho baseline was ~7264s, so pure-Python rho at this size is not feasible without >10x per-step speedup. Practice also timed out at 60s. BSGS needs ~2e8 table entries (too much memory). Untested ideas: negation map with cycle escape, batch 1024+, fewer Python ops per step.