7bc13a6eb2
bingx_direct.submit_intent: (1) empty/orderId-less ack (VST offline-symbol hole: code==0 + empty data) -> REJECTED, never fabricate fill from target_size; (2) honor upstream u- client id (intent.metadata promo_client_id/client_order_id) over self-minted p- id. rust_backend: EXIT asset-mismatch guard both sync+async paths — EXIT for asset X while slot holds Y -> NO_OPEN_POSITION/EXIT_ASSET_MISMATCH instead of asset-blind close (THETA 76bbf8ee cross-slot contamination). 9 regression tests, mutation-RED verified (guard flip).