chore(core): standardize SPDX copyright headers

Add SPDX copyright and license headers to source, test, migration,
template, and static files throughout the project.

Include the maintainer email in copyright notices and fill in the BSD
license copyright holder.

3 files changed, 12 insertions, 0 deletions

diff --git a/tests/tasks/test_receiver.py b/tests/tasks/test_receiver.py
index 7e8f531..17dd45a 100644
--- a/tests/tasks/test_receiver.py
+++ b/tests/tasks/test_receiver.py
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2026 Dennis Fink <me+coding@dennisfink.me>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
 import logging
 import uuid
 from types import ModuleType
diff --git a/tests/tasks/test_scanner.py b/tests/tasks/test_scanner.py
index 89e2995..332b8bf 100644
--- a/tests/tasks/test_scanner.py
+++ b/tests/tasks/test_scanner.py
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2026 Dennis Fink <me+coding@dennisfink.me>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
 from pathlib import Path
 from types import ModuleType
 from uuid import UUID
diff --git a/tests/tasks/test_sender.py b/tests/tasks/test_sender.py
index 1c8ef99..dac56a5 100644
--- a/tests/tasks/test_sender.py
+++ b/tests/tasks/test_sender.py
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2026 Dennis Fink <me+coding@dennisfink.me>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
 import logging
 import uuid
 from datetime import UTC, datetime