Corrected validation metrics with lmw thresholds

Fix thresholds: use lmw-calibrated values not sliding inference thresholds

Map High and Very High product sensitivity to 1.0% FPR threshold

Add product sensitivity level column to thresholds and validation tables

Add validation section with exact 50K metrics (cisco PI taxonomy GT)

Fix hidden_size fallback for T5Gemma2 encoder config

Remove Developed by field

Remove (cisco GT) label, fix image URLs

Update README: fix image URLs, clean thresholds table, remove enterprise qualifier

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initial commit