fix(domain,application,infrastructure,backend,app-tauri,frontend): Stop demande agent préserve la conversation ouverte — arrêt sans fermeture/clôture du chat, états cohérents après cancel sur les 3 adapters de session, cellule et workstate synchronisés — #343 (QA verte)

crates/application/src/workstate/actions.rs

@@ -245,13 +245,12 @@ pub trait StopAgentExecutionCascade: Send + Sync {
     ) -> Result<(), AppError>;
 }
 
-/// Stops an already-running agent's current work.
+/// Destructively stops an already-running agent runtime.
 ///
-/// Resolves the session by agent (structured first, then PTY). A structured
-/// session keeps its registry entry and receives `cancel_current_turn()`, so the
-/// provider conversation/context survives the stop. A PTY session has no finer
-/// turn boundary, so it is torn down through the existing [`CloseTerminal`]
-/// primitive (registry removal + process kill).
+/// Both structured and PTY runtimes are removed. Structured sessions first
+/// receive `cancel_current_turn()` so a per-turn child cannot survive teardown,
+/// then `shutdown()` is called. Conversation-level cancellation uses the
+/// separate [`crate::CancelAgentChat`] use case and never enters this path.
 pub struct StopAgentRuntime {
     live: Arc<LiveSessions>,
     close: Arc<CloseTerminal>,
@@ -317,7 +316,7 @@ impl StopAgentRuntime {
         self
     }
 
-    /// Stops the agent's current work.
+    /// Stops the agent's complete live runtime.
     ///
     /// # Errors
     /// Repeated stops are successful. A cancellation or runtime failure is returned