Fix content values to sentence case in example datasets

- FRFR: Convert category values from ALL CAPS to sentence case
  (e.g., "BODY PARTS" → "Body parts", "KITCHEN-RELATED" → "Kitchen-related")
- FRFR: Capitalize size values ("large"/"small" → "Large"/"Small")
- CMR: Convert condition labels to sentence case
  (e.g., "Control (Animacy)" → "Control animacy")

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jeremymanning