Assembles the Overview page: the cross-project, at-a-glance rollup of what is running, what recently happened, and how much work is waiting.

## TLDR

- Totals (projects, active runs, open TODOs, past runs), how past runs ended, and a two-week activity chart whose quiet days still show as empty bars rather than vanishing.
- Per project: whether it is running right now, how many runs it has had, its open TODO count, and whether it has tickets — ordered by most recent activity.
- A pure projection of what is already on disk; a project whose records cannot be read simply contributes nothing.

## Before writing SPEC.md files

Read https://raw.githubusercontent.com/brillout/sdd/refs/heads/main/sdd.md
