chore(licence): the Licensor and copyright holder is Cadasto B.V.

[rubentalstra]

What changed and why

The Licensor and copyright holder of FerroPIX's own work is now Cadasto B.V., which replaces Vernum Projecten B.V. Every statement of the holder changes in this one pull request: the LICENSE (Licensor: and The Licensed Work is (c) 2026 …), the NOTICE, every SPDX-FileCopyrightText header, the header template in CONTRIBUTING.md, and the Licensor sentence in MAINTAINERS.md. The BUSL-1.1 terms do not change, and maintainer credit stays a person.

git grep -n 'Vernum' now finds nothing. Part of the family change tracked from FerroHEALTH #31.

Closes #5

Licensing of contributions

• I accept the terms in CONTRIBUTING.md § Licensing of contributions: I have the right to submit this work, I license it under the project licence of the version it lands in, and I grant the Licensor the relicensing right stated there.

Checklist

• Shell and workflow files are clean: shellcheck --severity=style, actionlint, zizmor --min-severity=low .github/.
• Rust gates pass, once a workspace exists: no workspace yet.
• Docs are updated, if behaviour changed.
• Every commit is signed.
• No AI or assistant attribution anywhere in the commits or this PR.