Calculation record
Test common-shape source compatibility using independently verified gradients.
This tests the separable trial E_geom(a) + Q omega_L(a), not every
same-field action. Q is a canonical norm, never a mass assignment.
The companion momentum check uses the already computed contracted
full normal states, without rerunning their eigensystems.
Research context
Interpret numerical checks within the assumptions and limitations documented in these notes.