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 | D2 | 🟡 Per-head DONE | Multi-query grid. Per-head launch works (cos 0.999998, n_h=1-64 hd=64, n_h=2-8 hd=128, n_h=2 hd=256). Multi-CTA grid blocked: `flat_divide` + `epilogue_tma_store` layout mismatch. Requires full tma_partition refactor into kernel. |
 | D3 | ✅ DONE | SWA sequence length mask (in-kernel post-QK via tTMEM_LOADcS coordinates, swa_len Int32 scalar) |
 | D4 | ✅ DONE | Causal mask on SWA branch (k_coord > m_coord → -inf, combined with D3 via OR logic) |
-| D5 | 🟢 D5a+D5b DONE | D5a: normalize flag + LSE output. D5b: Per-row LSE + Python KV merge (cos 0.999994). D5c/D5d: fused kernel merge TODO. |
+| D5 | 🟢 D5a+D5b+D5c DONE | D5a: normalize flag + LSE output. D5b: Per-row LSE + Python KV merge (cos 0.999994). D5c: Sink bias (attn_sink) as logit modification in combined KV (cos 0.999996, single KV tile). Multi-tile blocked by D1.5. |
 | E1-E7 | TODO | Production extraction (class, custom op, cache, cleanup) |
 | NVFP4-3 | ✅ DONE | `use_2cta_instrs` conditional in gemm_runner.py. 1.7-1.9× throughput at prefill shapes. |