row 250 (Vikunja #450): K12 names the cause when the events read fails

The populated assertion prints the shim's answer, with ok and unavailable,
and the controller's release entries. Step 1 of the brief, on its own.

packages/conversation/tests/cohort.test.mjs

@@ -289,7 +289,8 @@ test("K12: a member forking in a loop: the freeze stops it, enumeration is compl
       assert.ok(listed.has(pid), `child ${pid} forked after TERM is in the proof's list`);
     }
     const ev = await shimRequest(h.rec().shim, "events");
-    assert.equal(ev.populated, 0);
+    // On failure, name the cause: the answer with `ok` and `unavailable`, and any release already run (row 250).
+    assert.equal(ev.populated, 0, JSON.stringify({ ev, releases: h.ctrl.evidence.releases }));
     assert.deepEqual(await memberPids(h.rec().shim), []);
   } finally {
     await h.close();