docs: add THIRD_PARTY_LICENSES for pixy.js bundled shader sources

pixy.module.min.js bundles GLSL from 42 Shadertoy shaders (CC-BY-NC-SA
3.0 default) plus GitHub sources (ashima/webgl-noise MIT, GPUImage BSD-3,
etc.). This notice provides full attribution to all original authors.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: web3dev1337

README.md

@@ -103,3 +103,5 @@ Everything else (editor, layers, compositing, gradient mapping, PBR generation,
 ## License
 
 MIT — see [LICENSE](LICENSE) for details.
+
+`pixy.module.min.js` bundles GLSL from Shadertoy authors (CC-BY-NC-SA 3.0) and other sources — see [THIRD_PARTY_LICENSES.md](THIRD_PARTY_LICENSES.md) for full attribution.

THIRD_PARTY_LICENSES.md

@@ -0,0 +1,71 @@
+# Third-Party Licenses
+
+## pixy.js Shader Library
+
+`pixy.module.min.js` is by [mebiusbox](https://github.com/mebiusbox) and licensed under MIT.
+Source: https://github.com/mebiusbox/pixy.js
+
+pixy.js bundles GLSL shader code from the following third-party sources.
+Shadertoy shaders use [CC-BY-NC-SA 3.0](https://creativecommons.org/licenses/by-nc-sa/3.0/)
+unless the author specified otherwise.
+
+### Shadertoy Sources
+
+| Effect | Source | Author |
+|--------|--------|--------|
+| Explosion | [Xd3GWn](https://www.shadertoy.com/view/Xd3GWn), [XdSXDc](https://www.shadertoy.com/view/XdSXDc) | — |
+| Explosion2 | [lsySzd](https://www.shadertoy.com/view/lsySzd) | Duke |
+| Cloud | [XsfXW8](https://www.shadertoy.com/view/XsfXW8), [XslGRr](https://www.shadertoy.com/view/XslGRr) | Inigo Quilez (iq) |
+| Fire | [XsXSWS](https://www.shadertoy.com/view/XsXSWS) | xbe |
+| Flame | [MdX3zr](https://www.shadertoy.com/view/MdX3zr) | — |
+| FlameEye | [ltBfDt](https://www.shadertoy.com/view/ltBfDt) | — |
+| Corona | [XdV3DW](https://www.shadertoy.com/view/XdV3DW) | — |
+| Sun | [MlKGDc](https://www.shadertoy.com/view/MlKGDc), [MsBGRh](https://www.shadertoy.com/view/MsBGRh), [4lBXzy](https://www.shadertoy.com/view/4lBXzy), [4sfGzS](https://www.shadertoy.com/view/4sfGzS), [4tlSzl](https://www.shadertoy.com/view/4tlSzl) | Inigo Quilez (iq) et al. |
+| Flare | [4scXWB](https://www.shadertoy.com/view/4scXWB) | — |
+| Flare2 | [Xs33R2](https://www.shadertoy.com/view/Xs33R2) | — |
+| Flare3 | [4sX3Rs](https://www.shadertoy.com/view/4sX3Rs) | — |
+| Caustics | [MdKXDm](https://www.shadertoy.com/view/MdKXDm) | — |
+| Energy | [XdjcWc](https://www.shadertoy.com/view/XdjcWc) | — |
+| Particle | [llGBWw](https://www.shadertoy.com/view/llGBWw) | — |
+| Cross | [ls3GRS](https://www.shadertoy.com/view/ls3GRS) | — |
+| MagicCircle | [4dfXDn](https://www.shadertoy.com/view/4dfXDn) | — |
+| Mandara | [MtcSz4](https://www.shadertoy.com/view/MtcSz4) | — |
+| Mandalas | [4tdSDr](https://www.shadertoy.com/view/4tdSDr) | — |
+| BrushStroke | [lt23D3](https://www.shadertoy.com/view/lt23D3) | — |
+| Squiggles | [MstBD4](https://www.shadertoy.com/view/MstBD4) | — |
+| Bubbles | [Xl2Bz3](https://www.shadertoy.com/view/Xl2Bz3) | — |
+| Speckle | [XlSBDz](https://www.shadertoy.com/view/XlSBDz) | — |
+| Pentagon | [MlBfWz](https://www.shadertoy.com/view/MlBfWz) | — |
+| KochCurve | [XdcGzH](https://www.shadertoy.com/view/XdcGzH) | — |
+| MarbleNoise | [lsf3WH](https://www.shadertoy.com/view/lsf3WH) | — |
+| CoherentNoise | [4dS3Wd](https://www.shadertoy.com/view/4dS3Wd) | — |
+| iqnoise/iqhash (utility) | [Xd23Dh](https://www.shadertoy.com/view/Xd23Dh) | Inigo Quilez (iq) |
+| Hash functions (utility) | [4djSRW](https://www.shadertoy.com/view/4djSRW) | Dave Hoskins |
+
+### GitHub Sources
+
+| Component | Source | Author | License |
+|-----------|--------|--------|---------|
+| Simplex noise | [ashima/webgl-noise](https://github.com/ashima/webgl-noise) | Stefan Gustavson | MIT |
+| Color balance | [liovch/GPUImage](https://github.com/liovch/GPUImage) | liovch | BSD-3 |
+| Sky scattering | [SimonWallner/kocmoc-demo](https://github.com/SimonWallner/kocmoc-demo) | Simon Wallner | — |
+| Cloud overlay | [GameTechDev/CloudsGPUPro6](https://github.com/GameTechDev/CloudsGPUPro6) | Intel GameTechDev | — |
+
+### Special Thanks
+
+As credited by mebiusbox on the EffectTextureMaker page:
+doxas, liovch, iq, KeyMaster-, knighty, XT95, Brandon Fogerty, FabriceNeyret2,
+TambakoJaguar, mu6k, anisoptera, namortrailblazer, vamoss, xbe,
+Iulian Marinescu Ghetau, Duke, hclarke, 104, vchizhov, smkgames,
+Stefan Gustavson, skaplun, Koltes, arxyz, diviaki, Sunpy, Hadyn,
+Dave_Hoskins, maysssam, joltz0r, Xor
+
+## ShaderBrew Custom GLSL Shaders
+
+The 52 custom shaders in `shader-defs.js` and `gen-custom.html` are original work
+and do not derive from Shadertoy or other third-party sources.
+
+## Three.js
+
+Three.js 0.174.0 — MIT License
+https://github.com/mrdoob/three.js