fix: trim down Zensical, fix copyright year #2160

Job	Run time
change-detection / Identify source changes	7s
cookie / Check included Noxfile	1m 43s
cookie / Distribution build	10m 32s
cookie / Format	9m 59s
cookie / Check Python 3.10 on macos-15-intel	4m 2s
cookie / Check Python 3.10 on ubuntu-latest	3m 52s
cookie / Check Python 3.14 on ubuntu-latest	4m 9s
cookie / Check Python pypy-3.11 on ubuntu-latest	2m 27s
cookie / Check Python 3.14 on windows-latest	4m 14s
cookie / Check Python 3.10 on windows-latest	3m 47s
cookie / Check Python 3.14 on macos-15-intel	6m 6s
cookie / Check Python 3.10 on macos-latest	2m 19s
cookie / Check Python 3.14 on macos-latest	1m 53s
rr-tests	0s
cookie / pass	5s
pass	4s
	55m 19s

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