From 4d3fd3ac6d8cafde9d086972d2d822a226aaf846 Mon Sep 17 00:00:00 2001
From: JavaZeroo <71128095+JavaZeroo@users.noreply.github.com>
Date: Fri, 30 Oct 2026 14:04:40 +0800
Subject: [PATCH] diag(shell): report input and session counters on failure
 refs #36

The failure dump now carries input high-water, rejected bytes, output bytes and the read error, so a stalled flood shows whether the keystroke reached the queue.
---
 experiments/shell/shell.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/experiments/shell/shell.cpp b/experiments/shell/shell.cpp
index 6941aa2a..94d14d7d 100644
--- a/experiments/shell/shell.cpp
+++ b/experiments/shell/shell.cpp
@@ -1436,7 +1436,14 @@ class ShellWindow {
             trace.close(); require(bool(trace), "candidate output evidence write failed");
         }
         if (!failure_.empty() && !mode_.empty()) {
-            std::cerr << "stage=" << stage_ << " bytes=" << result_.consumed << " screen=";
+            // The dump answers "did our side do its part" before the screen:
+            // input high-water/rejected tell whether the keystroke reached the
+            // bounded queue, and the session counters tell whether reads stalled.
+            std::cerr << "stage=" << stage_ << " bytes=" << result_.consumed
+                      << " input_high_water=" << input_.high_water
+                      << " input_rejected=" << input_.rejected
+                      << " output_bytes=" << session_.output_bytes
+                      << " read_error=" << session_.read_error << " screen=";
             parser_.screen.json(std::cerr); std::cerr << '\n';
         }
         require(failure_.empty(), failure_.c_str()); require(close_failure_.empty(), close_failure_.c_str());