FROSTYVERSE H2-091 — FROSTCELL NODE OWNERSHIP / 4D MULTIPLICITY ATTACK

WHY THIS TEST EXISTS
H2-090 closed the direct H-025 -> H-017 physical-coordinate bridge and showed
that one complete conservative source->destination handoff is one D-scale
second-variation work ledger.  It also showed a source half and destination half
of 1/2 D each.

That leaves a natural FrostCell-level question:
  Does a FrostTransit deform the whole eight-node FrostCell in a way that makes
  eight independent 1/2-D node ledgers participate, naturally giving 4D?

The user prefers this all-eight-node interpretation because all eight FrostNodes
belong to the FrostCell in which the transit occurs.  H2-091 therefore makes it
the PRIMARY hypothesis.

PRIMARY HYPOTHESIS
  8 corner FrostNodes x 1/2 D = 4 D.

FROSTY'S SIDEQUEST
  The ordinary exit face is selected from transit geometry.  Its four corner
  FrostNodes are tested as:

  4 face FrostNodes x 1 D = 4 D.

HOW H2-091 PREVENTS DOUBLE COUNTING
1. Eight-node participation is read from the inherited trilinear deformed-cell
   map.  Throughout a valid cell interior all eight nodal basis weights can be
   active; at an ordinary face boundary exactly four remain.
2. Work is independently decomposed through H-017's actual 12 FrostSegments of
   one FrostCell.  Each physical segment is counted once and then split evenly
   between its two endpoint FrostNodes.
3. The arithmetic candidates 8 x 1/2D and 4 x D are reported, but count as
   physical multiplicities only if they agree with that independent segment
   ledger.
4. All six incident supports around all eight corner FrostNodes are inventoried.
   This produces 36 unique physical segments around the cell: 12 cell edges and
   24 neighboring external segments.  H2-091 does not invent a rule saying all
   external segments receive a full FrostTransit work ledger.
5. Named deformed FrostCells are included so the ownership result is not only a
   flat-cube topology artifact.

PREDECLARED PRIMARY OUTCOMES
A_EIGHT_NODE_HALF_D_INDEPENDENT_4D
  All eight nodes are geometrically engaged AND the no-double-counting inherited
  work ledger really contains four D total from eight independent half-D nodes.

B_ALL_EIGHT_NODES_GEOMETRICALLY_ENGAGED_BUT_CURRENT_CELL_WORK_PARTITIONS_ONE_D
  The eight-node FrostCell picture is geometrically correct, but current H-017
  work is shared/partitioned rather than independently duplicated at each node.
  This does not forbid a later external-support mechanism; it means current FV
  mechanics have not earned the 8 x 1/2D multiplicity.

C_EIGHT_NODE_OWNERSHIP_NOT_CLOSED
  Either eight-node participation or work ownership fails to close.

SIDEQUEST OUTCOMES
A_FOUR_FACE_NODES_INDEPENDENT_4D
B_CROSSED_FACE_FOUR_SELECTED_BUT_CURRENT_CELL_WORK_IS_PARTITION_NOT_4D
C_FACE_SELECTION_OR_OWNERSHIP_NOT_CLOSED

GUARDRAILS
- FV mechanics first; no GR/precession/4D target amplitude selects the answer.
- No arbitrary four-node choice.
- No manual 1/2-D weight is assigned to each of eight nodes.
- No duplicated FrostSegment is silently counted twice.
- External neighboring supports are inventoried but not given invented work.
- H2-089 M1+M2 pair-total rule remains frozen and separate.
