Build: switch licensing to Apache-2.0 and consolidate build configuration (#14)

Author: Copilot

LICENSE

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+Copyright 2026 NXAI GmbH
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this product except in compliance with the License.
+You may obtain a copy of the License at
+
+    https://www.apache.org/licenses/LICENSE-2.0

NOTICE

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+# SPDX-License-Identifier: Apache-2.0
 from .flashrnn import flashrnn, FlashRNNConfig
 
 __all__ = ["flashrnn", "FlashRNNConfig"]

README.md

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+# SPDX-License-Identifier: Apache-2.0

flashrnn/__init__.py

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+# SPDX-License-Identifier: Apache-2.0
 import hashlib
 import os
 import pickle

flashrnn/autotune/__init__.py

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+# SPDX-License-Identifier: Apache-2.0
 # Integer CSP solver file - CONSTRINT
 # This script solves CSP problems tied to integer variables
 # and optimized for multiplicative and divisibility constraints (e.g. tiling sizes)

flashrnn/autotune/caching.py

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+# SPDX-License-Identifier: Apache-2.0
 import argparse
 from xlstm.benchmarking.profiling.xlstm_profiling import get_inputs
 from xlstm.benchmarking.profiling.xlstm_profiling import run_single

flashrnn/autotune/constrint.py

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+# SPDX-License-Identifier: Apache-2.0
 import subprocess
 import shlex
 import shutil

flashrnn/autotune/runner.py

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+# SPDX-License-Identifier: Apache-2.0
 import os
 import torch
 from tqdm import tqdm