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examples: add parallel research planner registry #174

Job	Run time
build and check the distribution	21s
live tests stay opt-in	17s
test (py3.13)	3m 50s
lint	12s
test (py3.12)	4m 25s
test (py3.14)	3m 33s
upstream drift (unlocked deps)	0s
	12m 38s