FrameBridge Original Expanded — release 0.3.4

Original FrameBridge material: GNU GPL version 3 only (GPL-3.0-only).
The complete license is included in LICENSE. COPYRIGHT.md and LICENSING.md
identify attribution, scope and third-party exceptions.

Third-party material retains its applicable copyrights and terms.
See licensing/third-party/THIRD-PARTY-NOTICES.md, retained native terms
and the original notices alongside vendored components.

Official release signatures and public readiness are recorded separately.
