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Claude
7b267fb632
#258 lost two thickness records to a rounding tie: wallKey quantises the midpoint with Math.round, and a wall of odd step length has its midpoint exactly on the tie, where the exact node 83/240 and the stored 0.345833333 fall on opposite sides. The #254 invariants pass on that file — their edge tolerance is 0.004 and the drift is 0.00417, so the check sits on its own boundary. checkWallKeys compares strings, and against endpoints snapped to the lattice: keying from the raw endpoints flags the healthy state and passes the broken one, which is what the first formulation in #258 got wrong. Measured on the owner's before/after pair: 0 findings before, exactly the two artefact walls after. Two shipped fixtures write keys off the contract (#260); recorded as a number, so the debt can neither grow nor be silently fixed. Issue: #259 User-Visible: no