diag(shell): Workspace 失败打印每个标签页计数器 (#73)

experiments/shell/shell.cpp

@@ -1151,6 +1151,21 @@ class ShellWindow {
         RECT client{}; GetClientRect(hwnd_, &client); size_changed(client.right, client.bottom);
     }
     HWND handle() const { return hwnd_; }
+    // Read-only diagnostic view used by the workspace failure dump (#73): the
+    // same counters the per-tab dump prints, without running its teardown path.
+    std::string diagnostic_line() const {
+        std::ostringstream out;
+        out << "input_high_water=" << input_.high_water
+            << " input_rejected=" << input_.rejected
+            << " output_bytes=" << session_.output_bytes
+            << " read_error=" << session_.read_error
+            << " consumed=" << result_.consumed
+            << " stage=" << stage_
+            << " closing=" << (closing_ ? "true" : "false")
+            << " child_signaled=" << (session_.child_signaled ? "true" : "false")
+            << " exit_code=" << session_.exit_code;
+        return out.str();
+    }
     void enable_operation_observation() {
         require_ui_thread(); require(!closing_,"operation observation must be enabled before close");
         if(operation_observations_.enabled()) return;

experiments/shell/workspace.hpp

@@ -648,6 +648,15 @@ class Workspace {
             // Workspace scenarios (selection, actions, shells) fail outside the
             // per-tab dump, so report the scenario identity and the message here.
             std::cerr << "workspace-failure mode=" << self->test_mode_ << " what=" << self->failure_ << '\n';
+            // Per-tab counters: which session was waiting matters more than the text.
+            for (const auto group : {Group::bottom, Group::main}) {
+                auto& tabs = self->group_tabs(group);
+                for (size_t index = 0; index < tabs.size(); ++index) {
+                    if (!tabs[index].shell) continue;
+                    std::cerr << "  tab " << (group == Group::main ? "main" : "bottom") << ':' << index << ' '
+                              << tabs[index].shell->diagnostic_line() << '\n';
+                }
+            }
             self->discard_and_close();
         }
         return DefWindowProcW(hwnd,message,wp,lp);