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Tommaso Bianchi
9125e0b4f8
kqih option (c). A FaceAndDirection connector stores a global face index, and an upstream edit can renumber faces so the index silently names a different one. The DANGLING case already threw; this is the in-range-but-wrong case, which nothing detected. Fingerprint the face on first resolve, compare afterwards, and report a mismatch into mate_conflicts — the channel that already marks the tree row — never as an error. A drift warning must not abort the recompute, because the alternative makes a legitimate Draft on a mated face fatal. WHAT THE FINGERPRINT IS, AND WHAT IT IS NOT. Surface type plus edge count. Not centroid or area: legitimate parametric edits move and resize faces, which is the entire point of the model, so either would fire on every dimension change. Not the normal, which is the tempting one — Draft deliberately tilts a face and Transform reorients a body, both legitimate. Type and edge count survive rigid motion, tilting and resizing, and catch the case that actually happens: a planar index sliding onto a fillet's cylindrical face after a dress-up inserts faces. The accepted cost is that a slide between two planar 4-edge faces is invisible. A partial detector that never cries wolf beats a total one that does, because a false alarm on a valid connector teaches people to ignore the warning. Connectors with no fingerprint record one on first recompute, so old recipes self-heal and both writers (DesignPanel, McpControl) get it without changing. THE VERSION BUMP IS THE IMPORTANT HALF. The task was specified with "do not change the recipe version" — that was wrong, and the rule is written in the header three lines above the constant: bump whenever save/load gains a field. deserialize_recipe() gates on v == VERSION and then reads a FLAT symmetric field list. A v3 blob under a v3 build that has grown two fields passes the gate and reads two ints past the end of every connector, into the next feature's bytes. That is silent corruption of a saved project, which is worse than any load error. Now v4, and v3 gets the existing clean refusal. cad_recipe_v3.bin is KEPT, unregenerated, with a test asserting it is refused and that nothing half-read is left behind. It is the only artefact that can prove the gate works, because it was written by an older build — regenerating it with today's code would destroy the evidence, which the test says in as many words. Suite 163 -> 167 cases, 2248 -> 2277 assertions, green. Fixture v4 34928 bytes. snaporca-kqih.