Design file format 2 with a migration chain (doc::format: older formats upgraded step by step, newer refused with a message, out-of-range numbers and broken occurrence placements refused); a corpus of designs saved by the M0, components-era, joints-era and current builds that must open and evaluate as saved (two pre-versioning behaviour changes listed with their reasons); damaged and hostile variants of every corpus file never panic

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

apps/solvecraft-cli/tests/corpus/scripts/m0-box-fillet-hole.json

@@ -0,0 +1,12 @@
+{"commands": [
+ {"command": "ChangeParameterCommand", "params": {"name": "width", "expression": "40 mm"}},
+ {"command": "SketchCreate", "params": {"plane": "XY"}},
+ {"command": "ShapeRectangleTwoPoint", "params": {"p0": [0, 0], "p1": [40, 30]}},
+ {"command": "SketchStop", "params": {}},
+ {"command": "Extrude", "params": {"distance": "width / 2"}},
+ {"command": "FusionFilletEdgesCommand", "params": {"edges": [[0, 0, 10]], "radius": 3}},
+ {"command": "SketchCreate", "params": {"plane": "XY"}},
+ {"command": "CircleCenterRadius", "params": {"center": [20, 15], "radius": 5}},
+ {"command": "SketchStop", "params": {}},
+ {"command": "Extrude", "params": {"distance": 20, "operation": "cut"}}
+]}