- checkAnswer now returns highest score across all accepted answers
instead of first match, fixing 95 false-low-confidence results
- Skip string containment for purely numeric strings to prevent
false positives like "1000" matching inside "10000"
- Preserve decimal points in normalize() (42.0 no longer becomes 420)
- Use word-boundary regex for number matching in responses
- Fix 47 wrong choices scoring too high (comma-formatted numbers,
verbose choices matching terse answers)
- Fix 17 prompts where no choice matched any accepted answer
- Challenge audit now reports zero failures across all 1472 prompts
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
