Add kp-detect-v23 submission

leaderboard/submissions/kp-detect-v23/README.md

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+# kp-detect-v23
+
+Ensemble of a transformer-based semantic classifier (DeBERTa-v3-base, 768-D mean-pooled embeddings + logistic regression) and an attack-feature gradient boosting detector (41-D engineered features, 5-seed ensemble, global temperature calibration). Routing by predicted attack type: semantic classifier weighted more heavily for paraphrase attacks, feature-based detector used alone for character-manipulation attacks.
+
+**Contact:** kelsamadicy@gmail.com

leaderboard/submissions/kp-detect-v23/metadata.json

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+{
+  "detector_name": "Kareem Elsamadicy (Independent Researcher)",
+  "date_released": "2026-05-23",
+  "contact_info": "kelsamadicy@gmail.com"
+}