Tracks open issues from a review that weren't fixed as part of this
branch's Smith-predictor and dedup work: non-configurable FSM
thresholds, Pid.scale()'s gain-scheduling hack, shared Kalman tuning
across the Smith controller's 3 filters, matplotlib imported at
module level in production code, no automated tests, and unchecked
config access.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
