Porthole manual components

The build script, stylesheet, and browser JavaScript adapt the Porthole
manual (https://github.com/jlumbroso/porthole-docs), Copyright 2026 Jérémie
Lumbroso. The source repository supplies the Apache License, Version 2.0.
See LICENSE (publisher) or assets/LICENSE.keyhole (published manual).

The coordination substrate derives from ADRs for AI's human-AI collaboration
template, Copyright 2026 Jérémie Lumbroso and the ADRs4AI crews, Apache-2.0.