Add reuse compliance [skip ci]

.github/workflows/reuse-compliance.yml

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+# SPDX-FileCopyrightText: 2026 The Khronos Group Inc.
+# SPDX-License-Identifier: Apache-2.0
+---
+name: REUSE Compliance Check
+on: [push, pull_request]
+permissions:
+  contents: read
+jobs:
+  reuse-compliance-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+      - name: REUSE Compliance Check
+        uses: fsfe/reuse-action@v6

CONTRIBUTING.adoc

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+// Copyright 2026 The Khronos Group Inc.
+// SPDX-License-Identifier: CC-BY-4.0
+
+= Contributing
+
+Contributions to the GLSL repository are welcome.
+
+== Contributor License Agreement (CLA)
+
+When you propose a pull request on this repository you must execute a
+Contributor License Agreement, to confirm you own your work and are granting
+Khronos the necessary permissions to redistribute it under our licenses.
+
+== AI-Assisted Contributions
+
+By submitting a Contribution to this repository, you additionally represent 
+that, to the extent any of Your Contributions were developed with the 
+assistance of artificial intelligence tools or AI-generated code, You have 
+exercised sufficient review, judgment, and creative direction over such tools 
+and resulting material to reasonably consider it Your original creation, and 
+You are not aware of any third-party license, intellectual property claim, or 
+other restriction arising from such use that is associated with any part of 
+Your Contribution or use thereof.

LICENSES/LicenseRef-mplus.txt

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+These fonts are free software. Unlimited permission is granted to use, copy, and
+distribute them, with or without modification, either commercially or
+noncommercially. THESE FONTS ARE PROVIDED "AS IS" WITHOUT WARRANTY.

REUSE.toml

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+version = 1
+SPDX-PackageName = "GLSL"
+SPDX-PackageDownloadLocation = "https://github.com/KhronosGroup/GLSL"
+
+[[annotations]]
+path = ["images/**.svg", "images/**.odg", "config/**/docinfo-header.html", ".gitignore"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2008-2024 The Khronos Group Inc."
+SPDX-License-Identifier = "CC-BY-4.0"
+
+[[annotations]]
+path = "katex/**"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2013-2019 Khan Academy and other contributors"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "config/khronos.css"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2013 Dan Allen"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "config/fonts/**"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2019 M+ Fonts Project"
+SPDX-License-Identifier = "LicenseRef-mplus"
+
+[[annotations]]
+path = "config/copyright-spec.adoc"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2014-2024 The Khronos Group Inc"
+SPDX-License-Identifier = "LicenseRef-KhronosSpecCopyright"
+
+[[annotations]]
+path = ["extensions/**/**.txt", "extensions/extension_headers/**.glsl"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "Various dates, various Khronos Members"
+SPDX-License-Identifier = "LicenseRef-Proprietary"