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generate(left_value, right_value) -> str (self-contained SVG)
Tilt formula:
The beam tilts toward the heavier side. Tilt angle (deg) is proportional
to the signed difference (left - right):
tilt = clamp(K * (left - right), -MAX, +MAX)
with K = 3.0 deg per unit and MAX = 15 deg. Positive tilt lowers the LEFT
pan (heavier-left dips down). When left == right the beam is level (0 deg).
Sign convention for SVG (y grows downward): the beam is rotated about the
central fulcrum by `tilt` degrees. The left end goes DOWN when left heavier.
In screen rotation terms, rotating by +tilt (clockwise) raises the left and
lowers the right, so we apply a rotation of -tilt to dip the heavier side.
The pans hang from the beam ends and move up/down with the tilt, but the pan
faces stay horizontal (they are not rotated, only translated to the rotated
beam-end positions).
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