Govern task context and advance execution pointer

tools/web/check-curves-desktop.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+import hashlib
+import json
+import pathlib
+import sys
+import tempfile
+import os
+import bpy
+
+def report():
+    curves = bpy.data.hair_curves.get("WebGapCurves") or bpy.data.curves.get("WebGapCurves")
+    if curves is None: raise RuntimeError("WebGapCurves is missing")
+    geometry = getattr(curves, "curves", None)
+    return {"name": curves.name, "pointCount": len(curves.attributes.get("position").data) if curves.attributes.get("position") else 0, "curveCount": len(geometry) if geometry is not None else 0}
+
+def main():
+    args = sys.argv[sys.argv.index("--") + 1:]
+    if len(args) != 2: raise SystemExit("usage: blender -b --python check-curves-desktop.py -- FIXTURE REPORT")
+    fixture, output = (pathlib.Path(value).resolve() for value in args)
+    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False); before = report(); descriptor, temporary = tempfile.mkstemp(prefix="m16-curves-reopen-", suffix=".blend"); os.close(descriptor)
+    try: bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True); bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=False); after = report()
+    finally: pathlib.Path(temporary).unlink(missing_ok=True)
+    if before != after: raise RuntimeError(f"Curves save/reopen drift: {before} != {after}")
+    value = {"schemaVersion": 1, "task": "M16-GAP-00007", "operation": "CURVES_DATABLOCK_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "curves": after, "saveReopen": "EXACT", "blenderVersion": bpy.app.version_string}; output.parent.mkdir(parents=True, exist_ok=True); output.write_text(json.dumps(value, indent=2, sort_keys=True) + "\n", encoding="utf-8"); print(f"curves-desktop-ok name={after['name']} saveReopen=exact")
+if __name__ == "__main__": main()