fix(runtime): isolate agent state by project (#101)

crates/infrastructure/tests/mcp_server.rs

@@ -1146,7 +1146,8 @@ async fn stop_agent_call_closes_the_live_session() {
     let (service, sessions) = build_service(contexts);
     // Pre-bind a live PTY session for the agent so StopAgent has something to close.
     let session_id = SessionId::from_uuid(Uuid::from_u128(555));
-    sessions.insert(
+    sessions.insert_in_project(
+        project().id,
         PtyHandle { session_id },
         TerminalSession::starting(
             session_id,
@@ -1156,7 +1157,9 @@ async fn stop_agent_call_closes_the_live_session() {
             PtySize { rows: 24, cols: 80 },
         ),
     );
-    assert!(sessions.session_for_agent(&agent_id).is_some());
+    assert!(sessions
+        .session_for_agent_in_project(project().id, &agent_id)
+        .is_some());
     let server = server(service);
 
     let raw = tools_call(1, "idea_stop_agent", json!({ "target": "dev" }));
@@ -1166,7 +1169,9 @@ async fn stop_agent_call_closes_the_live_session() {
 
     // CloseTerminal ran → the agent no longer has a live session.
     assert!(
-        sessions.session_for_agent(&agent_id).is_none(),
+        sessions
+            .session_for_agent_in_project(project().id, &agent_id)
+            .is_none(),
         "stop_agent should have removed the session"
     );
 }