feat(sp28): claimAcks slice + useTailStream/useMergedTail dispatch

src/lib/tail-stream.test.ts

@@ -127,6 +127,30 @@ describe("streamTail", () => {
     expect(calledUrl).toBe("/api/ta1-acks/stream");
   });
 
+  it("test_targets_claim_acks_stream_endpoint", async () => {
+    // SP28: the `claim-acks` resource is part of TailResource; the URL
+    // must be /api/claim-acks/stream. The claim↔ack link stream is a
+    // shared resource (not per-claim or per-ack) — both the ClaimDrawer
+    // and AckDrawer subscribe to the same endpoint and filter
+    // server-side via the page-specific filterFn passed to
+    // `useMergedTail`.
+    const driver = makeStream();
+    const fetchMock = vi.fn().mockResolvedValue(driver.response);
+    vi.stubGlobal("fetch", fetchMock);
+    // Drive an event so the iterator's first read resolves — same
+    // pattern as `test_parses_well_formed_ndjson_into_typed_events`
+    // (the `test_targets_acks_stream_endpoint` shape hangs in CI
+    // because it awaits `gen.next()` before any chunk arrives).
+    const gen = streamTail("claim-acks");
+    driver.push('{"type":"snapshot_end","data":{"count":0}}');
+    driver.close();
+    await gen.next();
+    await gen.return?.(undefined);
+    expect(fetchMock).toHaveBeenCalledTimes(1);
+    const [calledUrl] = fetchMock.mock.calls[0] as [string];
+    expect(calledUrl).toBe("/api/claim-acks/stream");
+  });
+
   it("test_handles_heartbeat_silently", async () => {
     // "Silently" here means: still yields the correctly-typed heartbeat
     // (no special filtering) — the consumer (useTailStream) decides what