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v1.6.0 — PID tuning evidence and arbitrary-input identification
- Bounded PID tuning with focus, free weights and direct FRD designs
- Independent PID integral and derivative formulas
- Process and general state-space identification from arbitrary input records
- Fix: ideal-derivative PID stability rejects hidden unstable modes
- Fix: lag-one residual metric is a Pearson correlation in [-1, 1]