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* Modeled threads: run down to a flat shoulder so a nut can bottom out An external thread running the whole face stopped with its groove clear of a shoulder, leaving up to a turn uncut above it. The groove now runs on past the plane of the face's end and is trimmed there, so its root reaches the shoulder at every angle and nothing past the plane is cut. A shoulder rising back along the face keeps the square stop, as do internal threads, tapers, runouts and lengths stopping short. Where the kernel refuses the trimmed cut, the groove also keeps the square stop and the feature warns. Closes #11610 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Kernel ladder: record the thread cases that now reach their shoulder Six cases gain the faces of the trimmed last turn; every other case is unchanged apart from its timing. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Thread at a shoulder: review fixes, and a test of the fallback The shoulder check starts just off the face, as the free-end check does, so a slope rising from the face counts. A groove the trim leaves nothing of now falls back to the square stop too. A test forces the fallback and reads its warning. The ladder's order and report go back to main's, changed only for the cases this moved. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Thread at a shoulder: check all the radii the groove cuts The check for a shoulder rising along the face looked a fixed distance out, which falls short of the groove on an undersized shaft. It now covers the groove's reach. A test reads how each kind of shoulder is classified. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Thread at a shoulder: test the trim that leaves nothing of the groove The test now reaches the path where the half-space keeps nothing, which is the one that must fall back to the square stop. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Thread at a shoulder: say so when the shoulder can't be checked If the kernel can't make the rising-shoulder check, the groove keeps the square stop as before, and the feature now warns that its last turn is left uncut. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>