Captures the idea of computing the HOLD-state negative floor from the Smith controller's internal Pot model (L*(theta_ist-theta_amb)/C) instead of the fixed -0.1 heuristic, plus the caveat that the Normal controller has no internal plant model to draw the same estimate from. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01M2ierBoxW3v7nUbDw3M2pE