Add async APIs, cancellation support, and typed metrics accessors #169

Job	Run time
Start gate (abort window)	2s
Cross-Compile manylinux2014 x86_64	2m 26s
Build and Test macOS 15 arm64 (no Metal)	2m 26s
Cross-Compile Android aarch64 (OpenCL/Adreno)	2m 26s
Cross-Compile manylinux_2_28 x86_64 (CUDA)	2m 26s
Cross-Compile Linux aarch64 (LTS)	2s
Cross-Compile Android aarch64	2m 26s
C++ Tests Ubuntu Latest x86_64	1m 49s
Build and Test macOS 15 arm64 (Metal)	2m 26s
Build and Test Windows 2025 x86 (VS 2026)	2m 33s
Build and Test macOS 14 arm64 (Metal)	2m 26s
Build and Test Windows 2025 x86_64 (VS 2026)	2m 31s
Java Tests macOS 14 arm64 (Metal)	1s
Java Tests macOS 15 arm64 (no Metal)	1s
Java Tests Ubuntu Latest x86_64	1s
Java Tests Windows 2025 x86_64 (VS 2026)	1s
Report	1s
Package JARs	1s
Check: main branch / SNAPSHOT	1s
Check: v* tag	1s
Publish Snapshot to Central	1s
Attach Signed Binaries to GitHub Release	1s
Publish Release to Central	1s
Update Snapshot Pre-release on GitHub	1s
	24m 11s

Provide feedback