fix(regression): preserve chat lifecycle subagent metadata

src/gateway/server-chat.agent-events.test.ts

@@ -756,6 +756,12 @@ describe("agent event handler", () => {
       key: "session-finished",
       kind: "direct",
       updatedAt: 1_650,
+      spawnedBy: "agent:main:main",
+      spawnedWorkspaceDir: "/tmp/subagent",
+      forkedFromParent: true,
+      spawnDepth: 2,
+      subagentRole: "orchestrator",
+      subagentControlScope: "children",
       fastMode: true,
       sendPolicy: "deny",
       verboseLevel: "on",
@@ -798,6 +804,12 @@ describe("agent event handler", () => {
       expect.objectContaining({
         sessionKey: "session-finished",
         phase: "end",
+        spawnedBy: "agent:main:main",
+        spawnedWorkspaceDir: "/tmp/subagent",
+        forkedFromParent: true,
+        spawnDepth: 2,
+        subagentRole: "orchestrator",
+        subagentControlScope: "children",
         fastMode: true,
         sendPolicy: "deny",
         verboseLevel: "on",

src/gateway/server-chat.ts

@@ -494,6 +494,11 @@ export function createAgentEventHandler({
       chatType: row?.chatType,
       origin: row?.origin,
       spawnedBy: row?.spawnedBy,
+      spawnedWorkspaceDir: row?.spawnedWorkspaceDir,
+      forkedFromParent: row?.forkedFromParent,
+      spawnDepth: row?.spawnDepth,
+      subagentRole: row?.subagentRole,
+      subagentControlScope: row?.subagentControlScope,
       label: row?.label,
       displayName: row?.displayName,
       deliveryContext: row?.deliveryContext,