feat(dashboard): overviewProjection — counters + kanban columns

src/app/(dashboard)/dashboard/orchestration/model/overviewProjection.ts

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+/** OrchSnapshot → overview counters + kanban columns. Pure. */
+import {
+  ORCH_STATES,
+  type OrchNode,
+  type OrchSnapshot,
+  type OrchState,
+} from "./orchestrationTypes";
+
+export interface OverviewData {
+  counts: Record<OrchState, number>;
+  columns: {
+    queued: OrchNode[];
+    running: OrchNode[];
+    waiting_approval: OrchNode[];
+    done: OrchNode[];
+  };
+}
+
+export function overviewProjection(snap: OrchSnapshot, comboActive: number): OverviewData {
+  const counts = Object.fromEntries(ORCH_STATES.map((s) => [s, 0])) as Record<OrchState, number>;
+  const columns: OverviewData["columns"] = {
+    queued: [],
+    running: [],
+    waiting_approval: [],
+    done: [],
+  };
+
+  for (const n of snap.nodes) {
+    if (n.kind !== "work" || !n.state) continue;
+    counts[n.state] += 1;
+    if (n.state === "queued" || n.state === "running" || n.state === "waiting_approval") {
+      columns[n.state].push(n);
+    } else {
+      columns.done.push(n);
+    }
+  }
+  columns.done.sort((a, b) => Date.parse(b.updatedAt ?? "0") - Date.parse(a.updatedAt ?? "0"));
+  counts.running += comboActive;
+  return { counts, columns };
+}

tests/unit/ui/overviewProjection.test.ts

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+/** Run: node --import tsx/esm --test tests/unit/ui/overviewProjection.test.ts */
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { overviewProjection } from "../../../src/app/(dashboard)/dashboard/orchestration/model/overviewProjection.ts";
+import type { OrchSnapshot } from "../../../src/app/(dashboard)/dashboard/orchestration/model/orchestrationTypes.ts";
+
+const snap: OrchSnapshot = {
+  nodes: [
+    { id: "orchestrator", kind: "orchestrator", label: "OmniRoute" },
+    { id: "cloud-agent:1", kind: "work", source: "cloud-agent", state: "running", label: "a" },
+    {
+      id: "cloud-agent:2",
+      kind: "work",
+      source: "cloud-agent",
+      state: "waiting_approval",
+      label: "b",
+    },
+    {
+      id: "a2a:3",
+      kind: "work",
+      source: "a2a",
+      state: "failed",
+      label: "c",
+      updatedAt: "2026-08-30T11:00:00Z",
+    },
+    { id: "a2a:3:activity", kind: "activity", source: "a2a", state: "running", label: "noise" },
+  ],
+  edges: [],
+  sources: [],
+  generatedAt: "2026-08-30T12:00:00Z",
+};
+
+describe("overviewProjection", () => {
+  it("counts only work nodes and adds comboActive to running", () => {
+    const { counts } = overviewProjection(snap, 4);
+    assert.equal(counts.running, 1 + 4);
+    assert.equal(counts.waiting_approval, 1);
+    assert.equal(counts.failed, 1);
+    assert.equal(counts.queued, 0);
+  });
+  it("folds terminals into the done column", () => {
+    const { columns } = overviewProjection(snap, 0);
+    assert.equal(columns.done.length, 1);
+    assert.equal(columns.done[0].id, "a2a:3");
+    assert.equal(columns.running.length, 1);
+  });
+});