Release notes from openclaw
・2026.9.3 Highlights Safer updates: rehearse core and plugin changes in isolated candidate state before activation, support eligible 2026.9.2 migrations, and recover abandoned update records without stopping a healthy matching Gateway.
・Related #136997.
・(#138839, #141109, #141175, #141562) Performance: preserve warm prompt caches, reduce unnecessary work during cold session updates and memory search, and reuse worker b