CS positional base period + absorbed-FE full-K SE parity vs R #2672

Job	Run time
Rust Unit Tests (macos-latest)	1m 55s
Rust Unit Tests (ubuntu-24.04-arm)	1m 24s
Rust Unit Tests (windows-latest)	2m 11s
Python Tests (ubuntu-24.04-arm, py3.11)	37m 49s
Rust Unit Tests (ubuntu-latest)	1m 21s
Python Tests (windows-latest, py3.14)	1h 2m 19s
Python Tests (ubuntu-latest, py3.13)	47m 8s
Python Tests (ubuntu-latest, py3.11)	1h 5m 42s
Python Tests (macos-latest, py3.13)	38m 13s
Python Tests (macos-latest, py3.11)	33m 0s
Python Tests (windows-latest, py3.13)	1h 0m 42s
Python Tests (ubuntu-latest, py3.14)	1h 5m 15s
Pure Python Fallback	1h 11m 42s
Python Tests (ubuntu-24.04-arm, py3.13)	35m 59s
Python Tests (macos-latest, py3.14)	29m 5s
Python Tests (windows-latest, py3.11)	54m 33s
Python Tests (ubuntu-24.04-arm, py3.14)	36m 17s
	10h 44m 35s

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