v0.7.0 - Two-RC identification and controller metrics

Toolbox-free two-RC identification and reusable controller metrics

This release adds a transparent battery equivalent-circuit parameter-identification workflow and promotes controller-comparison results to an export-ready engineering table.

Two-RC identification

• estimates positive R0, R1, C1, R2, and C2 values from timestamped current, independently estimated OCV, and terminal-voltage data
• separates the nonlinear time-constant search from the linear resistance solve
• enforces ordered fast and slow branches and rejects ill-conditioned or nonphysical candidates
• supports absolute or relative measurement timestamps
• evaluates fitted parameters on a genuinely separate held-out pulse profile
• includes deterministic malformed-input, repeatability, and timestamp-offset regression checks

Canonical benchmark:

Calibration RMSE: 0.401 mV
Held-out RMSE: 0.440 mV
Estimated time constants: 2.01 s and 33.88 s

The bundled voltage records are explicitly synthetic and deterministic. They validate the implementation and cross-validation workflow without claiming physical-cell calibration accuracy.

Controller comparison

• adds a reusable table for open-loop, PI, and filtered-PID performance
• reports deterministic steady error, overshoot, settling time, duty bounds, and saturation status
• supports direct CSV export and readback validation

Verification

• all 16 MATLAB and Simulink checks passed on MATLAB R2026a
• MATLAB Code Analyzer reported zero findings in the added and changed MATLAB files
• citation metadata passed the CFF schema validator
• Markdown links passed the repository link gate
• generated social preview verified at 1280 x 640 and 86.3 kB

See the two-RC example and closed-loop converter example for equations, assumptions, usage, validation, and limitations.