Adds try-fused-fallback-to-separate pattern to forward_target_raw, forward_online_f32, and forward_value_head — matching the existing pattern in forward_online_raw. Eliminates ~10-14 separate bias+ReLU kernel launches by fusing them into the preceding cuBLAS GEMM epilogue. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>