The document

Pages that point at things.

Living documents wired to the system they describe — bound to your files, linked to your diagrams, and still true next month.

Backed by your files

A page can be bound to a repository file, carrying a source and a revision, so it can be refreshed when that file changes — or written back to it.

Bound to a repo file — the page knows which file it came from and which revision it is at.
Refresh after edits — change the file, refresh the page, and the board catches up.
Write-back — the flow runs the other way too: edit on the board, write to the file, commit.

Deep-link a paragraph to the exact diagram element it explains, so the prose and the picture stop drifting apart.

Paragraph to node — a link lands on the specific element, not on the diagram in general.
Both directions — the diagram links back to the page, so either one is a way in.

The same text serves the board and the documentation, so nobody maintains a second copy that slowly stops matching the first.

Board and repo — one document, reachable from either side.
Markdown — pages are composed as markdown rather than trapped in a proprietary format.