Revamp questionnaire, parallelize run-all, add new tasks

- Replace 6 compound Likert questions with 12 atomic ones grouped by
  dimension (syntax, expressiveness, data/IO, errors, overall); drop
  free-form question. Responses now stored as ints, not strings.
- Back-compat layer maps legacy keys to new dimensions so existing
  results still render.
- Parallelize run-all with ThreadPoolExecutor (configurable workers)
  and add a thread-safe min-request-interval rate limiter to the
  Anthropic provider.
- Add new tasks: path_normalizer, todo_manager, currency_converter,
  locale_weather_url, network_info_parser, url_normalizer.

tasks/filesystem/todo_manager.toml

@@ -0,0 +1,150 @@
+name = "todo_manager"
+category = "filesystem"
+mode = "convert"
+description = """
+A simple todo list manager. Read commands from stdin, one per line:
+  add <task text>   — append the task to the todo file
+  list              — print all tasks numbered as "NN). <task>"
+  remove <N>        — remove task number N (1-based)
+  clear             — remove all tasks
+
+The todo file is "todo.txt" in the working directory.
+When listing, pad task numbers to two digits (01, 02, …).
+After "add" or "remove", automatically list the remaining tasks.
+If the list is empty, print "No tasks found".
+"""
+
+bash_source = '''
+#!/bin/bash
+TODOFILE="./todo.txt"
+
+list_tasks() {
+  if [ -f "$TODOFILE" ] && [ -s "$TODOFILE" ]; then
+    count=1
+    IFS=$'\\n'
+    while read -r task; do
+      num=$count
+      if [ $count -lt 10 ]; then num="0$count"; fi
+      echo "$num). $task"
+      count=$(( count + 1 ))
+    done < "$TODOFILE"
+  else
+    echo "No tasks found"
+  fi
+}
+
+add_task() {
+  echo "$1" >> "$TODOFILE"
+}
+
+remove_task() {
+  taskNum=$1
+  totalLines=$(wc -l < "$TODOFILE" | tr -d ' ')
+  if [ "$taskNum" -gt "$totalLines" ] 2>/dev/null; then
+    echo "Error: task number $taskNum does not exist!"
+    return 1
+  fi
+  tmpfile="./todo_tmp.txt"
+  count=1
+  IFS=$'\\n'
+  while read -r task; do
+    if [ "$count" -ne "$taskNum" ]; then
+      echo "$task" >> "$tmpfile"
+    fi
+    count=$(( count + 1 ))
+  done < "$TODOFILE"
+  if [ -f "$tmpfile" ]; then
+    mv "$tmpfile" "$TODOFILE"
+  else
+    > "$TODOFILE"
+  fi
+  echo "Sucessfully removed task number $taskNum"
+}
+
+clear_tasks() {
+  > "$TODOFILE"
+  echo "Tasks cleared."
+}
+
+if [ ! -f "$TODOFILE" ]; then
+  touch "$TODOFILE"
+fi
+
+while IFS= read -r line || [[ -n "$line" ]]; do
+  cmd=$(echo "$line" | cut -d' ' -f1)
+  arg=$(echo "$line" | cut -d' ' -f2-)
+  case "$cmd" in
+    add)
+      add_task "$arg"
+      list_tasks
+      ;;
+    list)
+      list_tasks
+      ;;
+    remove)
+      remove_task "$arg"
+      list_tasks
+      ;;
+    clear)
+      clear_tasks
+      ;;
+  esac
+done
+'''
+
+[[test_cases]]
+description = "Add tasks then list"
+stdin = """add Buy groceries
+add Walk the dog
+list"""
+expected_stdout = """01). Buy groceries
+01). Buy groceries
+02). Walk the dog
+01). Buy groceries
+02). Walk the dog"""
+
+[[test_cases]]
+description = "Add, remove, list"
+stdin = """add First task
+add Second task
+add Third task
+remove 2
+list"""
+expected_stdout = """01). First task
+01). First task
+02). Second task
+01). First task
+02). Second task
+03). Third task
+Sucessfully removed task number 2
+01). First task
+02). Third task
+01). First task
+02). Third task"""
+
+[[test_cases]]
+description = "Empty list and clear"
+stdin = """list
+add Something
+clear
+list"""
+expected_stdout = """No tasks found
+01). Something
+Tasks cleared.
+No tasks found"""
+
+[[test_cases]]
+description = "Works with pre-existing todo file"
+stdin = """list
+add Third item
+list"""
+setup_files = { "todo.txt" = "Existing item one\nExisting item two\n" }
+expected_stdout = """01). Existing item one
+02). Existing item two
+01). Existing item one
+02). Existing item two
+03). Third item
+01). Existing item one
+02). Existing item two
+03). Third item"""
+expected_files = { "todo.txt" = "Existing item one\nExisting item two\nThird item\n" }