fix(hub): agent 会话记忆在配置变更/发版后丢失 + Feishu thread 400 (#19)

Co-authored-by: Hong Jiarong <me@jrhim.com>
Co-committed-by: Hong Jiarong <me@jrhim.com>

hub/test/integration/agent-configuration.test.ts

@@ -43,7 +43,7 @@ describe("Organization Agent configuration management", () => {
         provider: "openrouter",
         roleId: "draft",
         model: "anthropic/claude-sonnet-5",
-        metadata: {},
+        metadata: { claudeSessionId: "sdk-session-old", userResumable: true },
       },
     });
     await configuration.setRoleSkills({
@@ -59,10 +59,12 @@ describe("Organization Agent configuration management", () => {
     expect(role).toMatchObject({ label: "课程草稿", systemPrompt: "write carefully" });
     expect(role.tools).toEqual(["read_file", "write_file", "cph_build"]);
     expect(role.skillBindings.map((binding) => binding.skill.name)).toEqual(["outline", "typst"]);
+    // Execution-surface change invalidates the provider session cursor but
+    // keeps the Hub session alive so its transcript stays reachable.
     await expect(prisma.agentSession.findUniqueOrThrow({ where: { id: "session-old-role-config" } }))
       .resolves.toMatchObject({
-        archivedAt: expect.any(Date),
-        metadata: expect.objectContaining({ userResumable: false }),
+        archivedAt: null,
+        metadata: expect.objectContaining({ userResumable: false, claudeSessionId: undefined }),
       });
   });