Expose project revision timeline

docs/circuit-list-editor-api.md

@@ -14,6 +14,16 @@ this value for optimistic concurrency checks.
 - `GET /projects/:projectId/history`
   - returns `currentRevision`, `undoDepth`, `redoDepth` and the current top
     change-set id for both persistent stacks
+- `GET /projects/:projectId/history/revisions`
+  - returns revision metadata in descending `revisionNumber` order
+  - optional query: `limit` (default `25`, maximum `100`) and exclusive
+    `beforeRevision`
+  - returns `projectId`, `currentRevision`, `revisions` and
+    `nextBeforeRevision`; use the latter as the next page's
+    `beforeRevision`
+  - each revision contains ids, number, timestamp, actor, source, description,
+    command type and payload schema version
+  - stored forward/inverse command payloads are intentionally not exposed
 - `POST /projects/:projectId/commands`
   - executes a supported versioned command as a new user revision
   - body: `{ "expectedRevision": 0, "command": { ... } }`