fix: persist manual workbench sessions

internal/cloud/server-code-agent-http.ts

@@ -18,7 +18,7 @@ import { createCodeAgentErrorPayload, handleCodeAgentChat } from "./code-agent-c
 import { defaultCodeAgentTraceStore } from "./code-agent-trace-store.ts";
 import { codeAgentSessionLifecycleSummary } from "./code-agent-session-lifecycle.ts";
 import { scheduleWorkbenchProjectionFinalizer } from "./workbench-projection-finalizer.ts";
-import { writeWorkbenchProjectionSession } from "./workbench-projection-writer.ts";
+import { writeWorkbenchProjectionSession, writeWorkbenchSessionAdmissionFact } from "./workbench-projection-writer.ts";
 import { buildAgentRunProjectionEventsFetchPlan } from "./workbench-projection-cursor.ts";
 import { createWorkbenchReadModel } from "./workbench-read-model.ts";
 import { codeAgentOtelTraceFields, emitCodeAgentOtelSpan } from "./otel-trace.ts";
@@ -273,6 +273,17 @@ async function createManualCodeAgentSession(request, response, options) {
       secretMaterialStored: false
     }
   });
+  await writeWorkbenchSessionAdmissionFact({
+    runtimeStore: options.runtimeStore,
+    session,
+    ownerUserId: options.actor?.id,
+    ownerRole: options.actor?.role,
+    projectId,
+    conversationId,
+    threadId: null,
+    status: "idle",
+    now
+  });
   sendJson(response, 201, {
     ok: true,
     status: "created",