chore(testing): add DevelopTest sandbox for manual API experiments #90

Job	Run time
Architecture and Documentation Guards	39s
Weekly Benchmark Diff	0s
Build and run tests (JDK 21)	55s
Build and run tests (JDK 17)	1m 8s
Build and run tests (JDK 25)	50s
Performance Smoke Check	0s
Examples Generation Smoke Test	48s
	4m 20s

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