cleanup: remove unused slot_token from nvfp4_moe_l2

L2 input is already slot-major, so slot_token was accepted but never
passed to the GEMM. Made it explicit by removing the parameter.

src/nvfp4_megamoe_kernel/nvfp4_mega_moe.py

@@ -161,12 +161,11 @@ def nvfp4_mega_moe_l1(
 
 
 def nvfp4_mega_moe_l2(
-    x_fp4,        # (num_slots, INTER//2) int8 packed E2M1
+    x_fp4,        # (num_slots, INTER//2) int8 packed E2M1 — already slot-major
     x_sf,         # (num_slots, sf_k_groups) float8_e4m3fn
     l2_weights,   # (E_per_rank, INTER//2, HIDDEN) int8, column-major for CUTLASS
     l2_scales,    # (E_per_rank, sf_k_groups, HIDDEN) float8_e4m3fn, column-major
     slot_expert_ids,  # (num_slots,) int32 — per-slot local expert IDs
-    slot_token,   # (num_slots,) int64 — token index per slot
     l2_global_sf, # (E_per_rank,) float32 — weight global scales
     alpha=1.0,    # fp32 scalar from stage_activation global scale
 ):
@@ -502,7 +501,7 @@ def nvfp4_mega_moe_full(
     # Step 5: L2 GEMM — slot-based, per-expert alpha
     l2_slots = nvfp4_mega_moe_l2(
         l1_fp4, l1_sf_out, l2_w, l2_sf,
-        slot_expert_local, slot_token,
+        slot_expert_local,
         l2_global_sf=l2_global_sf,
         alpha=l2_alpha,
     )  # (num_slots, HIDDEN) bfloat16