hartmandrector

**WORKFLOW SKILL** — Run, inspect, and iterate on the Polar Visualizer (`/`) and GPS Flight Viewer (`/gps`) in a real browser to develop and validate aero/visualization features. USE FOR: visually verifying force/moment vector changes; checking model rotation in body vs inertial frames; loading GPS tracks for replay; manipulating sliders, dropdowns, and checkboxes via Playwright; capturing screenshots for review; iterating on 3D scene-graph or rendering fixes that cannot be confirmed by `tsc` or `vitest` alone. DO NOT USE FOR: pure code refactors with no visual surface; unit-test-only changes; physics math validated by tests.