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chore(release): name the 2.1 line twinned #1153

Job	Run time
Detect changed paths	6s
Architecture and Documentation Guards	33s
Weekly Benchmark Diff	-1s
Build and run tests (JDK 17)	2m 3s
Performance Smoke Check	0s
Binary Compatibility (japicmp vs pom baseline)	0s
Examples Generation Smoke Test	1m 58s
CI Gate	2s
	4m 41s