fix(test): upsert project members before SavePlan in chat-refresh live

Duty assignees must be active members or activation path returns 400.

Co-authored-by: Cursor <cursoragent@cursor.com>

.doc/test-reports/assets/2026-09-15-chat-history-refresh-live/chat-refresh-live.py

@@ -207,6 +207,18 @@ def main():
         n_win2 = n_cat2 = 0
         texts2 = []
         if default_s == 200 and isinstance(plan, dict):
+            # Duty holders must be active project members before SavePlan.
+            for uid, role in (
+                (owner_id, "owner"),
+                (reviewer_id, "member"),
+                (approver_id, "member"),
+            ):
+                req(
+                    "POST",
+                    f"/api/v1/projects/{project_id}/members",
+                    owner_token,
+                    {"user_id": uid, "project_role": role},
+                )
             stages = plan.get("stages") or []
             for stg in stages:
                 for dt in stg.get("doc_tasks") or []:
@@ -220,6 +232,8 @@ def main():
                 "expected_plan_revision": 0,
                 "expected_selection_version": 1,
             })
+            if save_s != 200:
+                task_out["save_err"] = err_snip(None, save_raw)
             prev_s, preview, _, _ = req("POST", f"/api/v1/projects/{project_id}/activation-preview", owner_token, {})
             if prev_s == 200 and isinstance(preview, dict):
                 activate_s, act, act_raw, _ = req("POST", f"/api/v1/projects/{project_id}/workflow-instances/activate", owner_token, {