AO2 v0.4.81 stable release.\n\nEvidence:\n- Source commit: 654e030\n- Public Release Build run: https://github.com/uesugitorachiyo/ao2/actions/runs/28270966839\n- Local v0.4.81 release train/readiness packet: target/stable-release-prep-v0.4.81\n- Paired control-plane release: v0.1.14\n\nThis release includes macOS aarch64, Linux aarch64, Linux x86_64, and Windows x86_64 archives with signed provenance sidecars and release evidence summaries.