Rules out shelter, tension, drain wiring, yard drift and sway by
measurement; the cause is arithmetic (t2 peaks 4.4-4.9 kN vs a 3.2 kN
shackle, and hp=36 is the bare-bed constant). Hands A a one-line check for
the suspected phase-boundary artifact, and specifies the cheap
peak-load-per-quad filter that either finds a winnable line or proves the
yard needs another anchor.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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