Documents each tab's purpose, what it renders, and which endpoints it polls.
Pages that start with markup get the header in a <?php ?> block so it never
reaches the browser.
Also corrects the layer diagram in README-unraid.md: eight of eleven pages hold
no PHP logic and poll api/ for everything — only auth, monitor and scheduler
require an include/ file directly.
The folder that translates the OS into Varaverk's vocabulary had no docs of its own, so the
adapter contract and the three-layer web UI were only discoverable by reading the code.