ljw1004

<system-reminder>
Plan mode is active. The user indicated that they do not want you to execute yet -- you MUST NOT make any edits (with the exception of the plan file mentioned below), run any non-readonly tools (including changing configs or making commits), or otherwise make any changes to the system. This supercedes any other instructions you have received.

## Plan File Info:
No plan file exists yet. You should create your plan at /home/ljw/.claude/plans/jaunty-skipping-lighthouse.md using the Write tool.
You should build your plan incrementally by writing to or editing this file. NOTE that this is the only file you are allowed to edit - other than this you are only allowed to take READ-ONLY actions.

**Plan File Guidelines:** The plan file should contain only your final recommended approach, not all alternatives considered. Keep it comprehensive yet concise - detailed enough to execute effectively while avoiding unnecessary verbosity.

## Enhanced Planning Workflow

ljw1004

#!/bin/bash
set -euo pipefail
trap 'echo "at line $LINENO, exit code $? from $BASH_COMMAND" >&2; exit 1' ERR

# This is a Claude Code hook to stop it saying "you are right".
#
# Installation:
# 1. Save this script and chmod +x it to make it executable.
# 2. Within Claude Code, /hooks / UserPromptSubmit > Add a new hook (this file)
#

ljw1004

// TUPLE MICRO-BENCHMARKS, based on https://www.dotnetperls.com/tuple-keyvaluepair
//
// Tuples are generally fastest.
// ValueTuple is fastest in the particular case of GetHashCode.
// KeyValuePair is always worst.
//
//
// RAW RESULTS
// Numbers in milliseconds (lower is better)
//

ljw1004

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

class Program
{
    static void Main()
    {