Update license

Author: petebachant

LICENSE

@@ -1,6 +1,16 @@
-MIT License
+This project is licensed under a dual-license structure to appropriately cover
+both the software code and the non-code content (data, text, figures, etc.).
 
-Copyright (c) 2024 Calkit
+Source code (MIT License)
+
+All source code contained within this repository, including but not limited to
+files with the extensions .js, .py, .html, .css, .ts, .jsx, .tsx, shell
+scripts, build configurations, and their related files, is licensed under
+the MIT License.
+
+The MIT License (MIT)
+
+Copyright (c) 2025 Calkit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -19,3 +29,23 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+Content, data, and documentation (CC BY 4.0)
+
+All non-code assets, including but not limited to prose, documentation, data,
+figures, images, designs, and text written in Markdown or similar formats
+(e.g., files in a docs/ directory, this LICENSE file itself, or .txt files
+containing prose or data), are licensed under the Creative Commons Attribution
+4.0 International Public License (CC BY 4.0).
+
+To view a copy of this license, visit:
+
+CC BY 4.0 Deed (summary):
+https://creativecommons.org/licenses/by/4.0/
+
+CC BY 4.0 Legal Code (full license):
+https://creativecommons.org/licenses/by/4.0/legalcode
+
+This license requires you to give appropriate credit, provide a link to the
+license, and indicate if changes were made. You may do so in any reasonable
+manner, but not in any way that suggests the licensor endorses you or your use.