auto-execution

Auto Office 3.0 reference spoke, not loaded by 3.1 runs (they use the office CLI). Internal Auto Office v3 execution spoke. Use after an accepted plan to validate execution packets, acquire mutable role/write-scope ownership, dispatch executors or workers through the selected harness adapter, enforce protected paths and blast-radius limits, handle takeover/version checks, self-review mutations, and return durable evidence without widening scope.