feat: add guided exploration and share user-started MCP backend

scripts/update_installation.py

@@ -172,6 +172,9 @@ def _updated_entry(config: dict, template: dict, root: Path, names: tuple[str, .
     if not isinstance(environment, dict):
         raise ValueError("The existing Artemis MCP environment is not an object")
     updated["env"] = {**environment, **template["env"]}
+    # Earlier releases made Artemis mandatory for every Codex session. Migrate
+    # that setting while preserving enabled=false and all tool approval policies.
+    updated["required"] = False
     if "enabled_tools" in template or "enabled_tools" in config:
         updated["enabled_tools"] = list(names)
     # Per-tool approval/enablement policies belong to the user. Leave `tools`