v0.5.16 release (latest)

v0.5.16 release notes for the GitHub Release v0.5.16 (release task: Issue #1012).

Tag state (verified against origin)

Ref	Object	Points at
`v0.5.16`	annotated tag `a6e46c79d1b94b3de176424807c6b5b601fc81c6`	commit `7ce2ffd117586e5fdf31fc72c6d693231ddf076b`

Release pipeline cannot publish: the prerequisite-gate smoke pins an output shape the CLI no longer emits (Issue #1009; PR #1010)