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/pipeline/url_normalizer.toml

@@ -0,0 +1,79 @@
+name = "url_normalizer"
+category = "pipeline"
+mode = "convert"
+description = """
+Read URLs from stdin, one per line. Normalize each URL:
+1. If the URL already starts with "https://", keep it as-is.
+2. If it starts with "http://", keep it as-is.
+3. Otherwise, prepend "http://" to it.
+4. After normalization, validate that the URL matches a basic pattern:
+   it must have a protocol (http:// or https://), followed by at least
+   one character, a dot, and at least one more character for the domain.
+5. Output the normalized URL, or "INVALID: <original>" for invalid entries.
+
+Skip empty lines silently.
+"""
+
+bash_source = '''
+#!/bin/bash
+while IFS= read -r line || [[ -n "$line" ]]; do
+  # Skip empty lines
+  [[ -z "$line" ]] && continue
+
+  # Trim whitespace
+  url=$(echo "$line" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')
+  [[ -z "$url" ]] && continue
+
+  original="$url"
+
+  # Check if it already has https://
+  prefix8=$(echo "$url" | cut -c1-8)
+  if [[ "$prefix8" == "https://" ]]; then
+    normalized="$url"
+  else
+    prefix7=$(echo "$url" | cut -c1-7)
+    if [[ "$prefix7" == "http://" ]]; then
+      normalized="$url"
+    else
+      normalized="http://$url"
+    fi
+  fi
+
+  # Validate: protocol + something.something
+  if echo "$normalized" | grep -qE '^https?://[^/]+\.[^/]+'; then
+    echo "$normalized"
+  else
+    echo "INVALID: $original"
+  fi
+done
+'''
+
+[[test_cases]]
+description = "URLs with and without protocol"
+stdin = """example.com
+http://example.com
+https://example.com
+www.google.com/search?q=test"""
+expected_stdout = """http://example.com
+http://example.com
+https://example.com
+http://www.google.com/search?q=test"""
+
+[[test_cases]]
+description = "Invalid entries"
+stdin = """notaurl
+https://valid.example.com
+just-a-word"""
+expected_stdout = """INVALID: notaurl
+https://valid.example.com
+INVALID: just-a-word"""
+
+[[test_cases]]
+description = "Mixed valid and empty lines"
+stdin = """https://secure.site.org/path
+
+api.service.io:8080
+http://old.site.net"""
+expected_stdout = """https://secure.site.org/path
+http://api.service.io:8080
+http://old.site.net"""