Document the runs screen, the run context and the generated dashboard

docs/code/api.md

@@ -104,7 +104,8 @@ published to. Flows own the namespace; everything else is a client of it.
 |---|---|---|
 | `POST` | `/runs/flows/{name}` | queue one run — `{"params": {...}, "seed": 7, "draft": false, "no_cache": false}` |
 | `POST` | `/runs/flows/{name}/sweep` | queue many, sharing a `group_id` |
-| `GET` | `/runs` | the queryable history: `?flow=`, `?status=`, `?group=`, `?digest=`, `?limit=` |
+| `GET` | `/runs` | the queryable history: `?flow=`, `?status=`, `?group=`, `?digest=`, `?limit=`, `?offset=` |
+| `GET` | `/runs/overview` | one row per flow that has runs, with how many are running or queued |
 | `GET` | `/runs/{id}` | one run in full: params, result, per-node record, artifacts |
 | `POST` | `/runs/{id}/cancel` | stop it |
 | `GET` | `/runs/{id}/metrics?name=&stride=` | one metric's series, in step order; every series of the run without `name` |
@@ -141,6 +142,7 @@ code normally reaches these through `fluksio.save_artifact` /
 | `GET` | `/dashboards/` | every dashboard, without its contents |
 | `GET` | `/dashboards/{name}?draft=true` | the published document, or the editor's copy |
 | `POST` | `/dashboards/{name}` | create one |
+| `POST` | `/dashboards/from-flow/{flow}` | build `{flow}_results` from a batch flow's declared ports — a chart per streamed metric, a stat per output. 409 if it already exists |
 | `PUT` | `/dashboards/{name}` | save a draft |
 | `POST` | `/dashboards/{name}/publish` · `/discard` · `/rename` | |
 | `GET` `PUT` | `/panels/` | which device shows which dashboards |