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Remove undo-fit implementation plan #328

Job	Run time
env-prepare	3s
source-test (macos-15)	6m 6s
source-test (windows-2022)	10m 33s
source-test (ubuntu-24.04)	5m 47s
package-test (ubuntu-24.04)	12m 39s
package-test (windows-2022)	20m 16s
package-test (macos-15)	10m 43s
run-reusable-workflows / dashboard	1m 51s
	1h 7m 58s