Method
1. Encode
Extract the first 10 significant digits, discarding magnitude.
$$\text{encode}(x) \;\to\; [d_1,\, d_2,\, \ldots,\, d_{10}]$$
2. Curvature
Second finite difference — the discrete acceleration of the digit sequence.
$$\Delta^1_i = d_{i+1} - d_i \qquad \Delta^2_i = \Delta^1_{i+1} - \Delta^1_i$$
3. Position
Map the digit sequence to a clock angle. Scale-invariant.
$$f = 0.d_1 d_2 \ldots d_{10} \qquad \theta = f \times 2\pi$$
4. Comparison
The dot product of two constants' curvature vectors measures structural resonance. If the result has digits forming an arithmetic progression, they resonate.
$$\text{dot} = \sum_i \Delta^2_A[i] \cdot \Delta^2_B[i]$$