fix: bind agent sessions to role

hub/src/feishu/trigger.ts

@@ -180,23 +180,26 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     });
     const promptForAgent = withFeishuTriggerContext(agentPrompt, feishuTriggerContext);
 
-    // ADR-0017: provider+model-bound session. Reuse if one exists for this
-    // (project, provider, model) triple; otherwise create.
+    // ADR-0017: provider+role+model-bound session. Reuse if one exists for
+    // this (project, provider, role, model) tuple; otherwise create. Role is
+    // part of the key because role prompts/tool surfaces can differ even when
+    // the underlying model is the same.
     const existingSession = await deps.prisma.agentSession.findFirst({
-      where: { projectId, provider: providerId, model, archivedAt: null },
+      where: { projectId, provider: providerId, roleId, model, archivedAt: null },
       select: { id: true, metadata: true },
     });
     const session =
       existingSession !== null
         ? await deps.prisma.agentSession.update({
             where: { id: existingSession.id },
-            data: { provider: providerId, model, updatedAt: new Date() },
+            data: { provider: providerId, roleId, model, updatedAt: new Date() },
             select: { id: true, metadata: true },
           })
         : await deps.prisma.agentSession.create({
             data: {
               projectId,
               provider: providerId,
+              roleId,
               model,
               title: agentPrompt.slice(0, 40) || null,
               metadata: {},