fix(permissions): tools MCP inter-projets exposés (idea_project_*) + contactable agent/template persisté — update_agent_contactable (application/web-server/app-tauri), defaultContactable TemplateEditor save/reopen, groupes MCP 'IdeA inter-projets' avec fallback, permissions agent Contactable — #267 (QA verte)

crates/backend/src/dto.rs

@@ -3067,6 +3067,18 @@ pub struct UpdateAgentEffortRequestDto {
     pub effort: Option<EffortSelection>,
 }
 
+/// Request DTO for `update_agent_contactable`.
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct UpdateAgentContactableRequestDto {
+    /// Id of the owning project.
+    pub project_id: String,
+    /// Id of the agent whose cross-project contactability changes.
+    pub agent_id: String,
+    /// Whether agents from other projects may contact this agent.
+    pub contactable: bool,
+}
+
 /// Response DTO for `change_agent_profile`: the mutated agent plus the freshly
 /// relaunched session when a live session was hot-swapped (absent otherwise).
 #[derive(Debug, Clone, Serialize)]