[ui] Add semantic primitive ownership Build a layered Zenbu token and sizing system, make authored controls use native-underneath primitives, migrate mrjunejune without imposing visual surfaces, and document/enforce HTML ownership in the catalog and wiki. Co-authored-by: Copilot <[email protected]>

The author disclaims copyright to this source code.  In place of
a legal notice, here is a blessing:

    May you do good and not evil.
    May you find forgiveness for yourself and forgive others.
    May you share freely, never taking more than you give.