ningpy/intent-detection-V2.3

Intent V12.9 release (V2.3): flat schema + entities, Safety F1 93.1%, Multi-EM 88.0%, Joint 83.8% - clean schema + patch19 negatives + QA-shape val (QA held-out F1 96.6%, Joint 89.3%)

Intent V12.7 rollback (V2.3): flat schema + entities, Safety F1 92.0%, Multi-EM 87.4%, Joint 81.9% - stable production (rollback from V12.8 due to OOS/MT-LOG regression on QA scenarios)

Intent V12.8 release (V2.3): Safety F1 92.3%, Multi-EM 87.9%, Joint 82.5%, RF-code 97.8%, BLOCK-code 94.6% - MT-LOG dominance + Immuno RF + GI bleed + Pharmacy

initial commit