Merge: plugin-host handshake observability + transient (re)spawn retr… #177

Job	Run time
Build (x86_64-apple-darwin)	14m 18s
Build (x86_64-unknown-linux-gnu)	4m 58s
Build (aarch64-apple-darwin)	5m 29s
Build (x86_64-pc-windows-msvc)	11m 43s
Publish GitHub release (tags only)	13s
Publish to public repo (tags only)	8s
	36m 49s

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