Capture M16 gap execution artifacts

tools/web/check-action-channels-clean-empty-desktop.py

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+#!/usr/bin/env python3
+import hashlib
+import json
+import os
+import pathlib
+import sys
+import tempfile
+
+import bpy
+
+
+def action_report():
+    obj = bpy.data.objects.get("WebGapAnimChannelsCleanKeepObject")
+    if obj is None or obj.animation_data is None or obj.animation_data.action is None:
+        raise RuntimeError("WebGapAnimChannelsCleanKeepObject Action is missing")
+    action = obj.animation_data.action
+    channels = []
+    for layer in action.layers:
+        for strip in layer.strips:
+            for bag in strip.channelbags:
+                for curve in bag.fcurves:
+                    channels.append({
+                        "path": curve.data_path,
+                        "index": curve.array_index,
+                        "frames": [round(float(keyframe.co.x), 6) for keyframe in curve.keyframe_points],
+                    })
+    channels.sort(key=lambda value: (value["path"], value["index"]))
+    return {"name": action.name, "channels": channels}
+
+
+def state_report():
+    empty = bpy.data.objects.get("WebGapAnimChannelsCleanEmptyObject")
+    keep = bpy.data.objects.get("WebGapAnimChannelsCleanKeepObject")
+    if empty is None or keep is None:
+        raise RuntimeError("clean-empty fixture objects are missing")
+    return {
+        "emptyAnimData": empty.animation_data is not None,
+        "keepAction": action_report(),
+    }
+
+
+def main():
+    arguments = sys.argv[sys.argv.index("--") + 1 :]
+    if len(arguments) != 2:
+        raise SystemExit("usage: blender -b --python check-action-channels-clean-empty-desktop.py -- FIXTURE REPORT")
+    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
+    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
+    before = state_report()
+    if before["emptyAnimData"] or len(before["keepAction"]["channels"]) != 3:
+        raise RuntimeError(f"unexpected anim.channels_clean_empty result: {before}")
+    descriptor, temporary = tempfile.mkstemp(prefix="m16-anim-channels-clean-empty-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 = state_report()
+    finally:
+        pathlib.Path(temporary).unlink(missing_ok=True)
+    if before != after:
+        raise RuntimeError("anim.channels_clean_empty save/reopen drift")
+    report = {
+        "schemaVersion": 1,
+        "task": "M16-GAP-00154",
+        "operation": "ANIM_CHANNELS_CLEAN_EMPTY_DESKTOP",
+        "fixture": str(fixture),
+        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
+        "emptyAnimDataRemoved": True,
+        "keepAction": after["keepAction"],
+        "saveReopen": "EXACT",
+        "blenderVersion": bpy.app.version_string,
+    }
+    output.parent.mkdir(parents=True, exist_ok=True)
+    output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
+    print("anim-channels-clean-empty-desktop-ok removedEmpty=true keepChannels=3 saveReopen=exact")
+
+
+if __name__ == "__main__":
+    main()