Update 5.1 conformance tests with memoryview and euler, improve conformance output

- Enable memoryview() tests in 5.1 conformance (Python 3.13 supports __buffer__)
- Add test_mathutils_euler.py for 5.1 conformance
- Show Python version in conformance check output

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

conformance/5.1/test_mathutils_color.py

@@ -33,5 +33,5 @@ print(
     )
 )
 
-# Direct buffer access is supported at runtime via C buffer protocol
-# but not expressible in type stubs (requires Python 3.12+ __buffer__).
+# Direct buffer access is supported.
+print(memoryview(col).tobytes())

conformance/5.1/test_mathutils_euler.py

@@ -0,0 +1,35 @@
+import mathutils
+import math
+
+# Create a new euler with default axis rotation order.
+eul = mathutils.Euler((0.0, math.radians(45.0), 0.0), "XYZ")
+
+# Rotate the euler.
+eul.rotate_axis("Z", math.radians(10.0))
+
+# You can access its components by attribute or index.
+print("Euler X", eul.x)
+print("Euler Y", eul[1])
+print("Euler Z", eul[-1])
+
+# Components of an existing euler can be set.
+eul[:] = 1.0, 2.0, 3.0
+
+# Components of an existing euler can use slice notation to get a tuple.
+print("Values: {:f}, {:f}, {:f}".format(*eul))
+
+# The order can be set at any time too.
+eul.order = "ZYX"
+
+# Eulers can be used to rotate vectors.
+vec = mathutils.Vector((0.0, 0.0, 1.0))
+vec.rotate(eul)
+
+# Often its useful to convert the euler into a matrix so it can be used as
+# transformations with more flexibility.
+mat_rot = eul.to_matrix()
+mat_loc = mathutils.Matrix.Translation((2.0, 3.0, 4.0))
+mat = mat_loc @ mat_rot.to_4x4()
+
+# Direct buffer access is supported.
+print(memoryview(eul).tobytes())

conformance/5.1/test_mathutils_matrix.py

@@ -31,5 +31,5 @@ mat[0][0:3] = 0.0, 1.0, 2.0
 # Each item in a matrix is a vector so vector utility functions can be used.
 mat[0].xyz = 0.0, 1.0, 2.0
 
-# Direct buffer access is supported at runtime via C buffer protocol
-# but not expressible in type stubs (requires Python 3.12+ __buffer__).
+# Direct buffer access is supported.
+print(memoryview(mat).tobytes())

conformance/5.1/test_mathutils_quaternion.py

@@ -36,5 +36,5 @@ quat_avg = mathutils.Quaternion(exp_avg)
 print("Average rotation:")
 print(quat_avg)
 
-# Direct buffer access is supported at runtime via C buffer protocol
-# but not expressible in type stubs (requires Python 3.12+ __buffer__).
+# Direct buffer access is supported.
+print(memoryview(quat_avg).tobytes())

conformance/5.1/test_mathutils_vector.py

@@ -54,5 +54,5 @@ vec.xy = vec4d.zw
 vec.xyz = vec4d.wzz
 vec4d.wxyz = vec.yxyx
 
-# Direct buffer access is supported at runtime via C buffer protocol
-# but not expressible in type stubs (requires Python 3.12+ __buffer__).
+# Direct buffer access is supported.
+raw_data = memoryview(vec).tobytes()

main.py

@@ -433,7 +433,6 @@ def conformance_check(versions: list[str] | None = None) -> None:
     for version in versions:
         version_dir = dist_dir / version
         test_dir = conformance_dir / version
-        print(f"=== Conformance check against Blender {version} stubs ===")
 
         python_version_file = version_dir / ".python-version"
         python_version = (
@@ -442,6 +441,10 @@ def conformance_check(versions: list[str] | None = None) -> None:
             else "3.11"
         )
 
+        print(
+            f"=== Conformance check against Blender {version} stubs with Python {python_version} ==="
+        )
+
         config = version_dir / "pyrightconfig.conformance.json"
         config.write_text(
             json.dumps(