feat: release Colour Tools 0.1.0

SOURCE.md

@@ -0,0 +1,31 @@
+# Corresponding source and provenance
+
+The corresponding source for Colour Tools 0.1.0 is:
+
+https://git.add-ideas.de/lotobo/colour-tools/src/tag/v0.1.0
+
+Build that tag with Node.js 22 and the exact dependency graph recorded in
+`package-lock.json`:
+
+```sh
+npm ci
+npm run release:artifact
+```
+
+The generated JavaScript and CSS bundles are not the preferred form for
+modification. No runtime code is loaded from a CDN. The production ZIP contains
+this source pointer, the application licence, the dependency licence inventory,
+and the applicable third-party notices.
+
+## Implementation provenance
+
+- The application is original project code and uses the shared Toolbox SDK
+  packages at version 0.2.3 for its manifest contract, shell, and build checks.
+- Colour conversion and adaptation use Color.js 0.7.1. Its MIT licence is
+  reproduced in `LICENSES/colorjs.io-MIT.txt`.
+- The compositing, interpolation, palette, image-sampling, contrast, comparison,
+  gamut, and colour-vision utilities in `src/colour` and `src/palette` were
+  implemented for this project.
+- CSS Color 4 and WCAG 2.2 were used as public technical specifications. No
+  source code or branded assets were copied from the example websites that
+  informed the feature list.