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Tommaso BianchiandClaude Opus 5
cbbd24dcb4
Carries snaporca 572f794c84, d0f9a0052a, 9f7e4e3627 and 3974f8a170. Parity holds: 17 files identical, 8 diverging by their expected counts. EXACT AREA. A loop's area is now integrated entity by entity in traversal order — Green's theorem — instead of being shoelaced over the render polyline, which faceted every arc into 24 chords and lost 2.02 mm2 on a 3706.86 mm2 stadium. 0.054%, invisible on screen, and wrong in a number reported as "the area". OFFSET FOLLOWS THE TRAVERSAL. Offsetting a mirrored profile put one half on the wrong side and split the loop in two, because the chainer only followed p1->p0 links and each entity's offset side was taken from its stored direction. Chains are now orientation-aware, seeded at a free end, offset by `reversed ? -d : d`, and normalised head-to-tail on the way out — so offset is correct for any input ordering and its own output cannot reintroduce the problem. Both are the same underlying lesson, which has now cost three separate defects: an entity's STORED direction is not its direction of TRAVEL around the loop. THE LADDER. scripts/sketch-ladder.py is a graded suite of 2D sketches judged the way a person judges them — VERTEX, LENGTH, ARC, TANGENT, SYMMETRY, CLOSED — with area only as a cross-check, because area is derived and nobody can confirm it by eye. Eight rungs from a rectangle up to MPD5 from the StudyCadCam corpus, a dia 27 x 95 pin reproduced as its revolve half-profile with the R5 fillet tangency solved exactly. Entirely 2D: no extrude or any solid feature. Kernel here: all tests passed, 2681 assertions in 231 test cases, including the new "profile: a mirrored half offsets as one loop, not two". GUI target builds and links. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>