chore: add SPDX headers and ignore .task

Amolith created 

Assisted-by: Claude Opus 4.5 via Crush

Change summary

.gitignore         | 5 +++++
crush.json.license | 3 +++
2 files changed, 8 insertions(+)

Detailed changes

.gitignore 🔗 

@@ -1,3 +1,8 @@
+# SPDX-FileCopyrightText: Amolith <amolith@secluded.site>
+#
+# SPDX-License-Identifier: CC0-1.0
+
 .crush
 .chunkhound
 lune
+.task

crush.json.license 🔗 

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: Amolith <amolith@secluded.site>
+
+SPDX-License-Identifier: CC0-1.0