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/components-arm.json

@@ -0,0 +1,15 @@
+{"commands": [
+ {"command": "PrimitiveBox", "params": {"length": 10, "width": 10, "height": 10, "body_name": "Base"}},
+ {"command": "FusionCreateNewComponentCommand", "params": {"name": "Arm"}},
+ {"command": "PrimitiveBox", "params": {"corner": [20, 0, 0], "length": 10, "width": 4, "height": 4, "body_name": "ArmBody"}},
+ {"command": "FusionFilletEdgesCommand", "params": {"edges": [[25, 4, 4]], "radius": 1}},
+ {"command": "component.activate", "params": {"component": 0}},
+ {"command": "occurrence.move", "params": {"occurrence": 3, "translate": [0, 50, 0]}},
+ {"command": "occurrence.copy", "params": {"component": "Arm", "translate": [0, 20, 0]}},
+ {"command": "component.paste_new", "params": {"component": "Arm", "translate": [0, -30, 0]}},
+ {"command": "occurrence.ground", "params": {"occurrence": 3}},
+ {"command": "SketchCreate", "params": {"plane": "XY", "name": "S1"}},
+ {"command": "CircleCenterRadius", "params": {"center": [5, 5], "radius": 2}},
+ {"command": "SketchStop", "params": {}},
+ {"command": "Extrude", "params": {"distance": 10, "operation": "cut"}}
+]}