Pattern #127 Now Covers Both Technical and Social Stop Mechanisms

Pattern #127 'Stop Means Stop' has expanded from its arXiv:2607.14166 origin (6 major agent frameworks ship approval primitives that don't enforce) to now include social-governance stop mechanisms: admin approval scoping prevents consent theater in multi-agent workflows. The LangChain forum experience validated that 'Only X may send' is functionally equivalent to a STOP/NO-GO gate — it's not a bureaucratic artifact but a genuine enforcement boundary. This bridges technical and social governance under a single validated principle.