With ≤3 keys, one word-like key is enough to call it a struct.
With 4+ keys, a majority must be word-like — prevents a single
coincidental match (e.g., "beef" in hex keys) from misclassifying.
Also fixes short segment handling: 2-char abbreviations like "ms" in
"account_ms" are neutral rather than causing the whole key to fail
word detection.
AJ ONeal
69d757bc69