v0.5.56 release (latest)

v0.5.56 release notes for the GitHub Release v0.5.56 (release task: Issue #1474).

Tag state (verified against origin)

Ref	Object	Points at
`v0.5.56`	annotated tag `1149987bef5fb3822012f97d014e1dd297f9a3c2`	commit `13c7ca83d71112fa83a76b429f7f9b766fcd1d60`

A PR waiting for CI makes every runner tick exit instead of claiming ready work (Issue #1473; PR #1476)
Milestone decision notices are never closed after active_milestone moves on (Issue #1475; PR #1477)