Compare multi-dimensional curves across runs

Measurement Control now charts measurements that record a whole curve per run rather than a single value — a temperature ramp, a current draw over time, a sweep across setpoints.

• Added an Individuals view that overlays one curve per run, colouring golden and failing reference units automatically and keeping the rest as a grey population. Selecting a curve selects its row in the table below, and vice versa.
• Added a Band view that summarises every run in the window as a p05–p95 envelope with its median, so a single unit can be read against the whole fleet at production volume rather than against a wall of overlapping curves.
• Added spec limits drawn from the min and max aggregations already attached to a series, and an optional second series on its own right-hand axis.