fix(custom-cli): le bouton Stop annule le tour courant sans fermer la session et cascade l'annulation aux agents délégués — stop_agent suit l'arbre des dépendances actives (cancel_current_turn + préemption runtime + enfants d'exécution), TurnCancel tue le process du tour en cours, autorisation requester/sous-arbre sur idea_stop_agent, fixtures DTO runtime_state/node_id alignées — #257 (QA verte)

crates/domain/src/orchestrator.rs

@@ -259,10 +259,12 @@ pub enum OrchestratorCommand {
         /// Desired visibility for the launched session.
         visibility: OrchestratorVisibility,
     },
-    /// Stop a running agent by killing its terminal session.
+    /// Stop/cancel a running agent.
     StopAgent {
         /// Target agent display name.
         name: String,
+        /// Requesting agent, when the stop originates from an agent tool.
+        requester: Option<AgentId>,
     },
     /// Overwrite an agent's `.md` context with a new body.
     UpdateAgentContext {
@@ -482,9 +484,11 @@ impl OrchestratorRequest {
             }),
             "stop_agent" => Ok(OrchestratorCommand::StopAgent {
                 name: self.require_name(action)?,
+                requester: self.optional_requester(action)?,
             }),
             "agent.stop" => Ok(OrchestratorCommand::StopAgent {
                 name: self.require_target_agent(action)?,
+                requester: self.optional_requester(action)?,
             }),
             "update_agent_context" => Ok(OrchestratorCommand::UpdateAgentContext {
                 name: self.require_name(action)?,
@@ -965,7 +969,8 @@ mod tests {
         assert_eq!(
             r.validate().unwrap(),
             OrchestratorCommand::StopAgent {
-                name: "dev-backend".to_owned()
+                name: "dev-backend".to_owned(),
+                requester: None,
             }
         );
     }