fix(session): clean up in-memory terminal runtime bindings on close

close_session only cleared live_sessions and DB session_bindings, but
left session_runtime_bindings and terminal_runtime_bindings HashMaps
populated along with terminal_runtimes entries. After page refresh,
collect_workspace_session_runtime_bindings would still find these stale
bindings, causing closed sessions to reappear.

Now calls unbind_session_runtime_by_session to remove from both binding
maps, and remove_terminal_runtime_registration to clean up the runtime
registry, ensuring a clean teardown on session close.

Author: pallyoung

apps/server/src/services/session_runtime.rs

@@ -108,6 +108,27 @@ pub(crate) fn unbind_session_runtime_by_terminal(
     Ok(session_key)
 }
 
+pub(crate) fn unbind_session_runtime_by_session(
+    workspace_id: &str,
+    session_id: &str,
+    state: State<'_, AppState>,
+) -> Result<(), String> {
+    let key = session_runtime_key(workspace_id, session_id);
+    let terminal_id = state
+        .session_runtime_bindings
+        .lock()
+        .map_err(|e| e.to_string())?
+        .remove(&key);
+    if let Some(tid) = terminal_id {
+        state
+            .terminal_runtime_bindings
+            .lock()
+            .map_err(|e| e.to_string())?
+            .remove(&tid);
+    }
+    Ok(())
+}
+
 pub(crate) fn session_runtime_binding_for_terminal(
     terminal_id: u64,
     state: State<'_, AppState>,

apps/server/src/services/workspace.rs

@@ -563,7 +563,19 @@ pub(crate) fn close_session<S: ToString>(
     let _ = stop_agent_runtime_without_status_update(&workspace_id, &session_id, state);
     let _ = forget_live_session(state, &workspace_id, &session_id);
     let _ = crate::services::supervisor::disable_supervisor_mode(&workspace_id, &session_id, state);
-    remove_workspace_session_binding(state, &workspace_id, &session_id).map(|_| ())
+    remove_workspace_session_binding(state, &workspace_id, &session_id).map(|_| ())?;
+    let _ = crate::services::session_runtime::unbind_session_runtime_by_session(
+        &workspace_id,
+        &session_id,
+        state,
+    );
+    let _ =
+        crate::services::session_runtime::remove_terminal_runtime_registration(
+            &workspace_id,
+            &session_id,
+            state,
+        );
+    Ok(())
 }
 
 pub(crate) fn list_session_history(