fix: make legacy dataset provenance explicit #3210

Job	Run time
Pure Python Fallback	1h 12m 33s
Python Tests (windows-latest, py3.11)	57m 45s
Python Tests (windows-latest, py3.13)	55m 21s
Rust Unit Tests (windows-latest)	2m 15s
Python Tests (ubuntu-latest, py3.9)	1h 3m 30s
Rust Unit Tests (ubuntu-latest)	1m 22s
Python Tests (ubuntu-24.04-arm, py3.14)	32m 43s
Rust Unit Tests (ubuntu-24.04-arm)	1m 23s
Rust Unit Tests (macos-latest)	2m 0s
Python Tests (ubuntu-latest, py3.13)	1h 0m 51s
Python Tests (ubuntu-latest, py3.14)	1h 1m 57s
Python Tests (ubuntu-latest, py3.11)	1h 0m 17s
Python Tests (ubuntu-24.04-arm, py3.13)	32m 26s
Python Tests (ubuntu-24.04-arm, py3.11)	33m 9s
Python Tests (macos-latest, py3.11)	36m 48s
Python Tests (macos-latest, py3.14)	33m 51s
Python Tests (windows-latest, py3.14)	55m 23s
Python Tests (macos-latest, py3.13)	33m 58s
	11h 37m 32s

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