release: harden v0.8.59 readiness lane
Integrate the v0.8.59 release-readiness aggregate: command-boundary grouping, Responses schema hardening, Codex reasoning tiers, goal lifecycle/runtime sync, sub-agent stall guards, activity metadata rows, and provider metadata/auth fixes.
Credit surfaces are captured in the changelogs for Paulo, Nightt, yekern, and the Devin/Hunter integration work.
Co-authored-by: aboimpinto <1231687+aboimpinto@users.noreply.github.com>
Co-authored-by: nightt5879 <87569709+nightt5879@users.noreply.github.com>
Hunter B
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