v0.31.4 — agent-stack

• agent-interop and agent-harness name their subject within the first 57 characters (hub
  board row B-285; Hermes shows only that many). agent-interop was "Use when an agent talks to
  anything outside its process: MCP server or client, A2A " and is now "Use when an agent speaks
  MCP, A2A or a gateway beyond its"; agent-harness was "Use when the question is what the agent
  is told, not how its loop is wired: system" and is now "Use when deciding an agent's system
  prompt and tools, not". Lengths 283 and 296; the quoted triggers and the Not-for boundaries are
  unchanged.