feat(memory): accept real compaction and parallel activities

server-tools/persona-daily-fractal-memory/persona-daily-memory.test.mjs

@@ -31,6 +31,12 @@ function event(index, occurredAt = `2026-09-04T${String(8 + Math.floor(index / 6
     occurred_at: occurredAt,
     session_id: "SESSION-TEST",
     platform_window_id: `WINDOW-${index}`,
+    activity: {
+      what: `记录第${index}段协作`,
+      where: "Codex/ICE-CH-ZC001",
+      with_whom: ["ICE-GL∞"],
+      attention: "人格真实日记忆"
+    },
     branch_id: "memory-model",
     branch_summary: "人格主控的真实日分形记忆模型",
     day_summary: `当天持续把第1至${index}段协作折叠回同一日页`,
@@ -109,6 +115,20 @@ test("routing exposes summaries first and reads one exact node only", (t) => {
   assert.equal(node.kind, "semantic_branch");
 });
 
+test("an event may explicitly retain what, where, and with whom without splitting the persona day", (t) => {
+  const root = roots(t);
+  appendEvent({ ...root, event: event(1) });
+  const day = JSON.parse(fs.readFileSync(path.join(root.storeRoot, "years/2026/months/09/days/2026-09-04.json"), "utf8"));
+  const leaf = Object.values(day.nodes).find((node) => node.kind === "event_leaf");
+  assert.deepEqual(leaf.activity, {
+    what: "记录第1段协作",
+    where: "Codex/ICE-CH-ZC001",
+    with_whom: ["ICE-GL∞"],
+    attention: "人格真实日记忆"
+  });
+  assert.equal(day.nodes[day.root].children.length, 1);
+});
+
 test("event writes are immutable and an id collision fails closed", (t) => {
   const root = roots(t);
   const original = event(1);