feat(lanes): add a read-only feature picker to the Workspace page (B)

client/src/lib/api.ts

@@ -2013,8 +2013,26 @@ export const api = {
         method: "POST",
         body: JSON.stringify(body),
       }),
+    /**
+     * GET /api/lanes/:id/features — list all archived features for a lane.
+     * @param id The lane id.
+     * @returns `{ features }` — all {@link LaneFeature} records.
+     */
+    features: {
+      list: (id: number) =>
+        request<{ features: import("./types").LaneFeature[] }>(`/lanes/${id}/features`),
+      /**
+       * GET /api/lanes/:id/features/:slug — fetch an archived feature snapshot.
+       * @param id The lane id.
+       * @param slug The feature slug.
+       * @returns `{ feature }` — the {@link LaneFeature} record.
+       */
+      show: (id: number, slug: string) =>
+        request<{ feature: import("./types").LaneFeature }>(
+          `/lanes/${id}/features/${encodeURIComponent(slug)}`
+        ),
+    },
   },
-
   // ──────────────────────────────── Locks API ────────────────────────────────
   /** Named locks across all lanes: used for serialization and gating.
    *  Maps to `server/routes/locks.js`. */

client/src/lib/types.ts

@@ -2291,6 +2291,19 @@ export interface LaneNode {
 }
 
 /** A durable unit of parallel agent work: one cwd, one pipeline, many sessions over time. */
+
+/** An archived snapshot of a lane's feature state: a pipeline at a point in time. */
+export interface LaneFeature {
+  id: number;
+  lane_id: number;
+  slug: string;
+  title: string;
+  stage: string;
+  status: string;
+  archived_at: string | null;
+  pipeline_nodes: LaneNode[];
+  progress: number;
+}
 export interface Lane {
   id: number;
   title: string;