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/joints-hinge.json

@@ -0,0 +1,14 @@
+{"commands": [
+ {"command": "ChangeParameterCommand", "params": {"name": "open_angle", "expression": "90 deg"}},
+ {"command": "FusionCreateNewComponentCommand", "params": {"name": "LeafA"}},
+ {"command": "PrimitiveBox", "params": {"length": 40, "width": 30, "height": 3, "corner": [0, 0, 0]}},
+ {"command": "PrimitiveCylinder", "params": {"base": [0, 33, 4], "axis": [1, 0, 0], "radius": 4, "height": 40, "operation": "new"}},
+ {"command": "component.activate", "params": {"component": "root"}},
+ {"command": "FusionCreateNewComponentCommand", "params": {"name": "LeafB"}},
+ {"command": "PrimitiveBox", "params": {"length": 40, "width": 30, "height": 3, "corner": [0, 0, 0]}},
+ {"command": "PrimitiveCylinder", "params": {"base": [0, 33, 4], "axis": [1, 0, 0], "radius": 4, "height": 40, "operation": "new"}},
+ {"command": "component.activate", "params": {"component": "root"}},
+ {"command": "occurrence.ground", "params": {"occurrence": 2, "grounded": true}},
+ {"command": "JointAssembleCmdNew", "params": {"type": "revolute", "a": {"occurrence": "LeafA", "circle": [1, 37, 4]}, "b": {"occurrence": "LeafB", "circle": [1, 37, 4]}, "name": "Hinge"}},
+ {"command": "FusionMoveJointsCommand", "params": {"joint": "Hinge", "value": "open_angle"}}
+]}