feat: add RL signal capture pipeline and harden ci-host setup #57

Job	Run time
build (aarch64-unknown-linux-gnu, ubuntu-latest)	4m 15s
build (aarch64-apple-darwin, macos-latest)	3m 1s
build-linux-host-simd	10m 1s
build (x86_64-apple-darwin, macos-latest)	4m 41s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 49s
release	8s
	24m 55s

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