docs(licensing): add SPDX headers

Add SPDX copyright and license markers to repository metadata and
documentation files.

Use comment styles appropriate for git attributes, gitignore, the commit
message template, README, and justfile so license metadata is visible
without changing runtime behavior.

1 files changed, 6 insertions, 0 deletions

diff --git a/README.md b/README.md
index ab9a569..bf6a4ba 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2026 Dennis Fink <me+coding@dennisfink.me>
+
+SPDX-License-Identifier: BSD-3-Clause
+-->
+
 # transcode.sh
 
 > Batch transcode helper for media files using [ffmpeg](https://ffmpeg.org/).