Add ContinuationMode enum for channel-specific message continuation #118

Job	Run time
Start gate (abort window)	19s
Build and Test macOS 15 arm64 (no Metal)	1s
Cross-Compile Android aarch64	1s
Cross-Compile manylinux2014 x86_64	1s
Build and Test macOS 14 arm64 (Metal)	1s
Build and Test Windows 2025 x86 (VS 2026)	1s
C++ Tests Ubuntu Latest x86_64	1s
Cross-Compile manylinux_2_28 x86_64 (CUDA)	1s
Cross-Compile Linux aarch64 (LTS)	1s
Build and Test Windows 2025 x86_64 (VS 2026)	1s
Build and Test macOS 15 arm64 (Metal)	1s
Java Tests macOS 14 arm64 (Metal)	1s
Java Tests Ubuntu Latest x86_64	1s
Java Tests Windows 2025 x86_64 (VS 2026)	1s
Java Tests macOS 15 arm64 (no Metal)	1s
Report	1s
Package JARs	1s
Publish Release to Central	1s
Check: v* tag	1s
Check: main branch / SNAPSHOT	1s
Update Snapshot Pre-release on GitHub	1s
Publish Snapshot to Central	1s
Attach Signed Binaries to GitHub Release	1s
	41s

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