Feature eupl

[anaegel]

Changing to EUPL license.

[Copilot]

🔵 Needs a closer look

Critical licensing attribution issues and documentation changes require resolution and human review.

Pull request overview

This PR changes the licensing metadata to EUPL-1.2 and adds REUSE compliance support.

Changes:

• Adds SPDX metadata and EUPL/CC0 license texts.
• Adds REUSE configuration and CI validation.
• Updates documentation and removes the former root license file.

File summaries

File	Summary
van_genuchten.h	Adds SPDX metadata.
van_genuchten.cpp	Adds SPDX metadata.
tests/richards_unit_test.cpp	Adds SPDX metadata and a build command.
richards_plugin.cpp	Replaces the historical license header.
richards_linker.h	Replaces the historical license header.
richards_elem_disc.h	Adds SPDX metadata.
REUSE.toml	Adds repository license annotations.
README.md	Documents EUPL licensing and build instructions.
LICENSES/EUPL-1.2.txt	Adds the EUPL license text.
LICENSES/CC0-1.0.txt	Adds the CC0 license text.
LICENSE	Removes the former license text.
json_basics.hh	Adds SPDX metadata.
CMakeLists.txt	Adds SPDX metadata and replaces the historical header.
.github/workflows/reuse.yml	Adds REUSE compliance checking.

Review details

• Files reviewed: 14/14 changed files
• Comments generated: 4
• Review effort level: Lite

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.