package: one bank leaves the project as one .rsbank, or the export refuses and says why

Pure planner classifies missing/unreadable/unrepresentable and repairs transport
names; the verb digests, streams and commits atomically over a const session.

src/shell/panel/panel_bank_ops.cpp

@@ -16,6 +16,7 @@
 #include "shell/panel/panel_state.h"
 #include "shell/panel/panel_bank_ops.h"
 
+#include "shell/actions/package_export_action.h"  // doBankPackageExport — the export skin
 #include "shell/bank_ops/bank_ops.h"    // bankOp* promptless verbs
 #include "shell/persist/session.h"      // ReaSamplerSession — the live session the ops mutate
 
@@ -241,6 +242,7 @@ enum : unsigned int {
     kMenuDelete,
     kMenuEvacuate,
     kMenuCreate,
+    kMenuExport,            // export this bank as a .rsbank package
     kMenuRemove,            // remove selected sample(s) from the source bank
     kMenuMoveBase = 1000,   // move-to-bank: kMenuMoveBase + destination index
     kMenuCopyBase = 2000,   // copy-to-bank: kMenuCopyBase + destination index
@@ -265,6 +267,7 @@ void showTabMenu(int screenX, int screenY, const std::string& bankId) {
     menuAppend(menu, kMenuRename, "Rename...");
     menuAppend(menu, kMenuEvacuate, "Evacuate to pool", /*grayed=*/!nonEmpty);
     menuAppend(menu, kMenuDelete, "Delete...");
+    menuAppend(menu, kMenuExport, "Export as package...");
     menuSeparator(menu);
     menuAppend(menu, kMenuCreate, "New bank...");
 
@@ -277,6 +280,7 @@ void showTabMenu(int screenX, int screenY, const std::string& bankId) {
         case kMenuRename:   doRenameBank(bankId); break;
         case kMenuEvacuate: doEvacuateBank(bankId); break;
         case kMenuDelete:   doDeleteBank(bankId); break;
+        case kMenuExport:   doBankPackageExport(*g_panel.session, bankId); break;
         case kMenuCreate:   doCreateBank(); break;
         default: break;
     }