The one-slot context model — time and branches from a single field

Contexts are just nodes with one optional linkURL copied

A context can declare after — the context it follows. That single link is the only structure:

• a chain of after links (d1 ← d2 ← d3 …) is a timeline

• a fork (two contexts both after d3) is a branch / what-if

• no after (unordered labels) is a set of perspectives

So you never build a time engine. You build a small graph of contexts, and time is just the shape "one long chain."