Polish model-specific recipe YAML formatting

- Drop unnecessary single quotes around `$import` keys in the
  generator-produced nvfp4-kv_fp8_cast recipes; `$` is not special in YAML
  and the hand-written recipes already use the unquoted form.
- Bump SPDX copyright year from 2024 to 2026 on the new YAML files to
  match the repository's LICENSE_HEADER.
- Insert a blank line between the `imports:` block and the following
  `metadata:` section to match the hand-written recipe style.

Signed-off-by: Shengliang Xu <shengliangx@nvidia.com>

Author: shengliangxu

modelopt_recipes/huggingface/gemma/ptq/int8_sq-kv_fp8_cast.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

modelopt_recipes/huggingface/gemma/ptq/w4a8_awq-kv_fp8_cast.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

modelopt_recipes/huggingface/mpt/ptq/w4a8_awq-kv_fp8_cast.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

modelopt_recipes/huggingface/nemotron_vl/ptq/disabled_quantizers.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

modelopt_recipes/huggingface/nemotron_vl/ptq/nvfp4-kv_fp8_cast.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,14 +22,15 @@ imports:
   w4a4_nvfp4_nvfp4: configs/ptq/units/w4a4_nvfp4_nvfp4
   disabled_quantizers: huggingface/nemotron_vl/ptq/disabled_quantizers
   kv_fp8_cast: configs/ptq/units/kv_fp8_cast
+
 metadata:
   recipe_type: ptq
   description: 'Nemotron VL PTQ recipe (nvfp4): same numerics as the general nvfp4 preset, applied to the decoder (text generation) component only (vision/encoder
     branches are skipped).'
 quantize:
   algorithm: max
   quant_cfg:
-    - '$import': base_disable_all
-    - '$import': w4a4_nvfp4_nvfp4
-    - '$import': kv_fp8_cast
-    - '$import': disabled_quantizers
+    - $import: base_disable_all
+    - $import: w4a4_nvfp4_nvfp4
+    - $import: kv_fp8_cast
+    - $import: disabled_quantizers

modelopt_recipes/huggingface/phi4mm/ptq/disabled_quantizers.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

modelopt_recipes/huggingface/phi4mm/ptq/nvfp4-kv_fp8_cast.yaml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,14 +22,15 @@ imports:
   w4a4_nvfp4_nvfp4: configs/ptq/units/w4a4_nvfp4_nvfp4
   disabled_quantizers: huggingface/phi4mm/ptq/disabled_quantizers
   kv_fp8_cast: configs/ptq/units/kv_fp8_cast
+
 metadata:
   recipe_type: ptq
   description: 'Phi-4-Multimodal PTQ recipe (nvfp4): same numerics as the general nvfp4 preset, applied to the language model only (speech, audio, image,
     and vision branches are skipped).'
 quantize:
   algorithm: max
   quant_cfg:
-    - '$import': base_disable_all
-    - '$import': w4a4_nvfp4_nvfp4
-    - '$import': kv_fp8_cast
-    - '$import': disabled_quantizers
+    - $import: base_disable_all
+    - $import: w4a4_nvfp4_nvfp4
+    - $import: kv_fp8_cast
+    - $import: disabled_quantizers