openai/gpt-5.2-chat → A (3:2)

Side A turns a static pinned icon into a functional POST form that reuses the existing /ui set_garden_pin flow, adds the necessary next_path plumbing, updates styles, and extends the browser test to verify unpinning from ranked child lists—clearly fixing a real UX gap. Side B improves visual semantics by switching from ordinal-based to min–max score-based gradients with solid unit tests, but it’s a presentation refinement rather than enabling new functionality.