refactor(engine): extract TokenBreaking from TextFlowSupport #831

Job	Run time
Architecture and Documentation Guards	44s
Weekly Benchmark Diff	0s
Binary Compatibility (japicmp vs pom baseline)	41s
Test suite without poi-ooxml (optional-deps regression)	59s
Build and run tests (JDK 21)	1m 0s
Performance Smoke Check	1m 11s
Build and run tests (JDK 25)	45s
Build and run tests (JDK 17)	1m 19s
Examples Generation Smoke Test	1m 7s
	7m 46s

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