H-090 BUILD / CONSTRUCTION VALIDATION
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These checks validate software construction only. They are NOT scientific evidence.
No full R25/R33 GR score was opened during package smoke testing.

PASS: Python 3.10 grammar parse for all packaged .py files.
PASS: H-090 import/dependency chain.
PASS: zero-turn RK4 path remains exactly straight in synthetic construction control.
PASS: inherited H-089-R2 tiny boundary-sign regression remains fixed.
PASS: factorized H-084 frozen-rate algebra is perpendicular and reflection-covariant.
PASS: factorized cached current-cell convergence reproduces inherited H-088 frozen-rate
      on GR-closed generated fields to floating-point precision in development validation.
PASS: all-face curved event solver completed low-R construction cases.
PASS: R25 GR-CLOSED smoke: four initial seed cells completed expected forward-wall ticks
      without non-positive wall events or event-solver failure.
PASS: RK4 8-substep trajectory compared against finer numerical integration; differences
      were tiny relative to a FrostCell and did not justify doubling user runtime.
PASS: R39/R45 remain disabled in H-090 telemetry configuration.
PASS: visible per-R case progress meter retained.

Important scientific note:
A low-resolution development run was allowed to falsify software/mechanical behavior, but
its GR scores are not packaged or promoted as H-090 evidence. H-090 remains frozen before
the user's fresh R25/R33 run; no full-run result was used to retune it.
