Codex Plus v0.1.0-preview.12

Preview.12 fixes current watch attention after explicit cancellation of a terminal source error. Error history, uncertain admission/withdrawal and unacknowledged input remain visible.

A bounded Snap OSS follow-up qualified ordinary endpoint setup and explicit cancellation of a running observer: three completed native turns, continued observation below its event limit, and no reads or callbacks after stop. The earlier 17-turn qualification and its limits remain documented.

Monitoring and reporting retain preview.11 verification/rollback support. Workers, monitoring and reporting share this single version; existing worker identities, explicit invocation and native ownership remain unchanged.

Validation: 354 passing tests, clean 129-file inventory, reproducible three-component archives and the eight-guide Pages build. The declared native compatibility baseline remains 0.162.1; the controlled 0.166.0 scenes do not establish general compatibility or long-running operation.

Managed deployment selects immutable files for new processes. Existing MCP/coordinator processes retain their captured release until normal reconnect. No daemon or report-server restart is required.