shiftsimulator

Add a new tack/gybe decision strategy or a new boat polar to shiftsim. Use when the user wants to model a new tactical rule (when to tack/gybe) or a new boat's performance.

Add a new wind model (oscillating/persistent/puff/spatial variant) or author a scenario JSON for shiftsim. Use when the user wants to model a new kind of wind shift or set up a new comparison scenario.

Run a shiftsim scenario and compare boats/strategies — produce the comparison table, ladder-gain chart, tracks, and animated replay. Use when the user wants to run a matchup or interpret results.

Sanity-check the shiftsim physics/model after changes — run the regression suite and the known-result tactical checks so realism doesn't silently break. Use after editing the simulator, polar, wind, or strategy code.