chore: groundwork for media library feature

docs/design/README.md

@@ -29,6 +29,8 @@ The visual spec of record for the back-office SPA and the transactional emails,
 | [Articles](screens/articles.md) | `/article` | 14 | `source/RenewCMS Screens Back-office.dc.html` |
 | [New article](screens/new-article.md) | `modal from anywhere · /article/new` | 5 | `source/RenewCMS Screens Back-office.dc.html` |
 | [Editor](screens/editor.md) | `/article/:id/edit` | 22 | `source/RenewCMS Screens Back-office.dc.html` |
+| [Media](screens/media.md) | `/media` | 41 | `source/RenewCMS Screens Back-office.dc.html` |
+| [Media picker](screens/media-picker.md) | `/article/:id/edit` (dialog) | 13 | `source/RenewCMS Screens Back-office.dc.html` |
 | [Integration](screens/integration.md) | `/integration` | 2 | `source/RenewCMS Screens Back-office.dc.html` |
 | [Users](screens/users.md) | `/users` | 17 | `source/RenewCMS Screens Back-office.dc.html` |
 | [Settings](screens/settings.md) | `/settings` | 1 | `source/RenewCMS Screens Back-office.dc.html` |
@@ -38,6 +40,7 @@ The visual spec of record for the back-office SPA and the transactional emails,
 
 ## Other boards
 
+- `source/MediaFrame.dc.html`: the frame that draws the Media and Media picker states (the Back-office board imports it). Like `AppFrame.dc.html`, it holds the exact values.
 - `source/RenewCMS Prototype.dc.html`: the clickable flows (first run, edit and publish, password reset, delete, session expiry mid-edit).
 - `source/RenewCMS Handoff.dc.html`: the handoff page the first markdown here was generated from. It predates the Users and Profile screens and the invitation email, so it does not list them. Those are written by hand from the Back-office board, `AppFrame.dc.html`, the Prototype and `emails/invitation.html`.
 - `source/RenewCMS Components Product.dc.html`: not regenerated for the new screens either. The matching component changes are in `components.md`, under "Added with the Users and Profile screens" and "Added with roles, invite actions and Settings".