v0.5.53 release (latest)

v0.5.53 release notes for the GitHub Release v0.5.53 (release task: Issue #1451).

Tag state (verified against origin)

Ref	Object	Points at
`v0.5.53`	annotated tag `db81734c7ac9deaaf467ace73f8858cd8227170f`	commit `05903dca273060ac9a94009851d647f0e715db84`

A provider 401 (invalid model API key) is retried every tick instead of blocking as credential_missing (Issue #1450; PR #1453)