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generate(reading, unit, full_scale, major_step, size) -> str (self-contained SVG)
FULL-SCALE MAPPING (documented):
The dial sweeps `full_scale` units over a SWEEP = 270 degrees arc.
The needle's rest (zero) position is at the LOWER-LEFT, and the scale
increases clockwise to the LOWER-RIGHT (a 90-deg gap at the bottom).
Angle convention: clockwise angle measured from 12 o'clock (top), where
x = cx + r*sin(theta), y = cy - r*cos(theta).
Zero sits at -135 deg (lower-left); full scale at +135 deg (lower-right).
frac = clamp(reading / full_scale, 0, 1)
needle_angle = -135 + frac * 270 (degrees, clockwise-from-top)
Majors are relabelled from 0..full_scale in steps of `major_step`.
e.g. full_scale=1000, major_step=100 -> 0,100,...,1000 (11 majors).
Backward compatible: generate(reading, unit) still defaults to a
0..1000 face with majors every 100.
CIRCLE DIAL MODE (dial="circle"):
A full 360-deg round face (e.g. a kitchen scale). 0 sits at the top
(12 o'clock); labels run clockwise every `major_step` all the way
around. The full-scale value coincides with 0 at the top.
frac = reading / full_scale (mod 1 for the needle)
needle_angle = frac * 360 (degrees, clockwise-from-top)
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