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/environment/path_normalizer.toml

@@ -0,0 +1,97 @@
+name = "path_normalizer"
+category = "environment"
+mode = "convert"
+description = """
+Read file paths from stdin, one per line. Normalize each path:
+1. Replace a leading "~" with the value of $HOME.
+2. Remove trailing slashes (except for root "/").
+3. Collapse consecutive slashes into one.
+4. Resolve "." components (remove them).
+5. Resolve ".." components (go up one directory level).
+Output the cleaned path, one per line.
+Skip empty lines.
+"""
+
+bash_source = '''
+#!/bin/bash
+while IFS= read -r line || [[ -n "$line" ]]; do
+  [[ -z "$line" ]] && continue
+
+  # Expand tilde
+  path=$(echo "$line" | sed "s:^~:$HOME:")
+
+  # Collapse multiple slashes
+  path=$(echo "$path" | sed 's:/\\+:/:g')
+
+  # Remove trailing slash (but keep root)
+  path=$(echo "$path" | sed 's:/$::')
+  [[ -z "$path" ]] && path="/"
+
+  # Resolve . and .. components
+  IFS='/' read -ra parts <<< "$path"
+  result=()
+  absolute=""
+  if [[ "$path" == /* ]]; then
+    absolute="/"
+  fi
+
+  for part in "${parts[@]}"; do
+    if [[ "$part" == "." || "$part" == "" ]]; then
+      continue
+    elif [[ "$part" == ".." ]]; then
+      if [[ ${#result[@]} -gt 0 && "${result[-1]}" != ".." ]]; then
+        unset 'result[${#result[@]}-1]'
+      elif [[ -z "$absolute" ]]; then
+        result+=("..")
+      fi
+    else
+      result+=("$part")
+    fi
+  done
+
+  if [[ -n "$absolute" ]]; then
+    final="/"
+    IFS='/'; final+="${result[*]}"
+  else
+    IFS='/'; final="${result[*]}"
+  fi
+  [[ -z "$final" ]] && final="/"
+
+  echo "$final"
+done
+'''
+
+[[test_cases]]
+description = "Tilde expansion and trailing slashes"
+stdin = """~/Documents/
+~/projects/code
+/var/log/"""
+expected_stdout = """/Users/testuser/Documents
+/Users/testuser/projects/code
+/var/log"""
+env = { "HOME" = "/Users/testuser" }
+
+[[test_cases]]
+description = "Resolving . and .. components"
+stdin = """/usr/local/./bin
+/home/user/../shared/docs
+/a/b/c/../../d"""
+expected_stdout = """/usr/local/bin
+/home/shared/docs
+/a/d"""
+
+[[test_cases]]
+description = "Collapsing multiple slashes"
+stdin = """/usr//local///bin
+/var/log//syslog"""
+expected_stdout = """/usr/local/bin
+/var/log/syslog"""
+
+[[test_cases]]
+description = "Root and relative paths"
+stdin = """/
+./config/settings
+../parent/child"""
+expected_stdout = """/
+config/settings
+../parent/child"""