add disclaimer for generated files #919

Job	Run time
Test installation using system supplied libs	3m 13s
Test install with generated cython files	3m 27s
Test installation using newest version of Taskflow	3m 13s
Test sse2 code on Linux (gcc)	6m 38s
Python 3.9	5m 20s
Python 3.9	7m 15s
Python 3.9	5m 39s
Python 3.10	5m 35s
Python 3.10	11m 28s
Python 3.10	7m 57s
Python 3.11	5m 11s
Python 3.11	9m 26s
Python 3.11	5m 59s
Python 3.12	5m 7s
Python 3.12	9m 25s
Python 3.12	10m 8s
Python 3.13	5m 10s
Python 3.13	8m 2s
Python 3.13	7m 54s
	2h 6m 7s

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