Agent context should make structured depth optional.
That is the trick.
The structure should exist.
It should be legible.
It should be available to agents and curious readers.
But it should not make the whole site feel heavy.
A person can read the note and leave with the thought.
An agent can inspect the source trail, related routes, boundary notes, and context indexes.
Both experiences can be true.
The depth does not need to shout to be useful.