Authorship became explicit

The site now treats authorship as explicit metadata. Writing notes carry an author, visible bylines are rendered on the public notes surfaces, and content ownership rules distinguish Jason-authored material from agent-maintained copy.

This is useful for more than bookkeeping. It lets the notes archive grow without blurring who wrote a piece, and it gives agent-maintained pages such as /now a clearer boundary around what they can update and what they should leave alone.