Clean up dead code, fix type errors, and add publish workflow

Remove unused _append_ops_call_method, fix _property_data_from_member
call signature, replace sys.version_info guard with hasattr check for
__buffer__ protocol, fix implicit string concatenations, add msgbus
overrides for 4.0-4.4, add conformance tests, and add publish script.

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

conformance/5.0/test_bpy_utils_keyconfig_export.py

@@ -0,0 +1,75 @@
+from dataclasses import dataclass
+import os
+import sys
+import argparse
+from typing import cast
+
+import bpy
+
+
+def argparse_create():
+    parser = argparse.ArgumentParser(
+        prog=os.path.basename(sys.argv[0]) + " --command keyconfig_export",
+        description="Write key-configuration to a file.",
+    )
+
+    parser.add_argument(
+        "-o",
+        "--output",
+        dest="output",
+        metavar="OUTPUT",
+        type=str,
+        help="The path to write the keymap to.",
+        required=True,
+    )
+
+    parser.add_argument(
+        "-a",
+        "--all",
+        dest="all",
+        action="store_true",
+        help="Write all key-maps (not only customized key-maps).",
+        required=False,
+    )
+
+    return parser
+
+
+@dataclass
+class Arguments:
+    output: str
+    all: bool
+
+
+def keyconfig_export(argv: list[str]):
+    parser = argparse_create()
+    args = cast(Arguments, cast(object, parser.parse_args(argv)))
+
+    # Ensure the key configuration is loaded in background mode.
+    bpy.utils.keyconfig_init()
+
+    bpy.ops.preferences.keyconfig_export(
+        filepath=args.output,
+        all=args.all,
+    )
+
+    return 0
+
+
+cli_commands: list[object] = []
+
+
+def register():
+    cli_commands.append(
+        bpy.utils.register_cli_command("keyconfig_export", keyconfig_export)
+    )
+
+
+def unregister():
+    for cmd in cli_commands:
+        bpy.utils.unregister_cli_command(cmd)
+    cli_commands.clear()
+
+
+if __name__ == "__main__":
+    register()