FROSTYVERSE H2-090 — SHARED-COORDINATE / D-OWNERSHIP CLOSURE ATTACK

BACKGROUND
H2-038 derived the existing D magnitude from motion-induced FrostSegment strain
work. H2-085/H2-086 found an exact six-support structural factor four in
FrostNode release/opening mechanics. H2-089 showed D-work and one release mode
have the same normalized quadratic work law, but did not identify their common
physical coordinate.

H2-090 tests the most direct inherited coordinate route available:

  H-025 derives a physically strained FrostSegment relation vector r(beta).
  H-017 already accepts a physical FrostNode-to-FrostNode displacement vector.
  H2-090 passes r(beta) directly to H-017. No coefficient, fitted map, or target
  is inserted between them.

The test then measures source-side positive work, destination-side opposing work,
the signed conservative net work, and the H-021 six-support partition at each
node. Because H2-038's D is the quadratic q^2 term, H2-090 compares the SECOND
VARIATION of the inherited transit work curve: rest work and its first-order
tangent are removed before comparing to the H-041 motion-strain work.

PREDECLARED OUTCOMES
A_ONE_MODE_D
  One transverse reference mode has the same second-variation work as D.
  This would directly support structural four as a work multiplicity.

B_FULL_HANDOFF_D_MODES_PARTITION
  The complete source->destination conservative handoff equals D, while the four
  transverse reference units partition that work. The coordinate bridge closes,
  but simple mode-energy counting does not derive four independent D copies.

C_NO_COORDINATE_CLOSURE
  The inherited vector composition or work curvature fails.

GUARDRAILS
- No GR or perihelion target enters the main test.
- No fitted strain->aperture scale.
- Direction, FQ template, and common coupling-scale ablations are included.
- Net/free energy is not created; signed net work must remain zero.
- A self-normalized W=1/2 xi^2 identity is explicitly rejected as proof.
- H2-089's M1+M2 pair-total orbital bookkeeping remains frozen and separate.
