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
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bherbruckandClaude Opus 5.5 committed 2026-10-08 11:37:33 +00:00
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commit f413a86d3d
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{
"format": "solvecraft/1",
"name": "Untitled",
"units": "mm",
"params": [],
"features": [
{
"id": 1,
"name": "Contour",
"suppressed": false,
"type": "sketch",
"plane": {
"type": "custom",
"plane": {
"origin": [
0.0,
0.0,
0.0
],
"x_dir": [
1.0,
0.0,
0.0
],
"y_dir": [
0.0,
0.0,
-1.0
]
}
},
"sketch": {
"points": [
{
"id": "origin",
"pos": [
0.0,
0.0
],
"fixed": true
},
{
"id": "l1.start",
"pos": [
0.0,
0.0
],
"fixed": false
},
{
"id": "l1.end",
"pos": [
40.0,
0.0
],
"fixed": false
},
{
"id": "l2.end",
"pos": [
40.0,
-30.0
],
"fixed": false
},
{
"id": "l3.end",
"pos": [
70.0,
-30.0
],
"fixed": false
}
],
"curves": [
{
"id": "l1",
"type": "line",
"a": 1,
"b": 2,
"construction": false
},
{
"id": "l2",
"type": "line",
"a": 2,
"b": 3,
"construction": false
},
{
"id": "l3",
"type": "line",
"a": 3,
"b": 4,
"construction": false
}
],
"constraints": [],
"counters": {}
}
},
{
"id": 2,
"name": "ContourFlange",
"suppressed": false,
"param_names": [
"d1"
],
"type": "sheet_contour",
"sketch": 1,
"curves": [
"l1",
"l2",
"l3"
],
"distance": "50"
}
],
"next_id": 3
}