Orphan branch storing Contributor License Agreement signatures for the SourceBans++ web panel.

• Agreement text: CLA.md on main
• Gating workflow: .github/workflows/cla.yml on main
• Rationale + how-to-sign: CONTRIBUTING.md on main

The contributor-assistant/github-action workflow appends each signature to signatures/cla.json on this branch. The file is created on the first successful sign — do not commit it manually (the action treats a pre-existing file as a fatal error).

This branch is intentionally an orphan (no shared history with main).