Merge Ε-W2: bank export and bank import, both verbs and both panel rows

Union of two parallel tracks. Both action rows, both menu rows, both link
edges survive; the two package CLAUDE.md files now describe the post-merge
reality rather than either side's pre-merge scope.

src/app/main.cpp

@@ -27,6 +27,7 @@
 #include "shell/actions/bank_actions.h"          // multi-bank action family
 #include "shell/actions/design_view_actions.h"   // Design View action family
 #include "shell/actions/package_export_action.h" // bank-package export action body
+#include "shell/actions/package_import_action.h" // bank-package import action body
 #include "core/wire/bake_wire.h"                 // kBakeActionSuffix (the shared action id)
 #include "shell/capture/bake_land.h"             // resample-bake landing action body
 #include "shell/capture/capture_batch.h"         // batch + recapture action bodies
@@ -93,6 +94,7 @@ static void RunRecaptureFromSource(int) { capture::RunRecaptureFromSource(g_sess
 static void RunRenderTrackInPlace(int) { capture::RunRenderTrackInPlace(g_session); }
 static void RunResampleBake(int)      { capture::RunResampleBake(g_session); }
 static void RunExportBankPackage(int) { reasampler::doBankPackageExport(g_session, g_session.book().activeBankId()); }
+static void RunImportBankPackage(int) { reasampler::doImportBankPackage(g_session); }
 static void RunShowVersion(int) {
     // On-demand only — no unconditional startup print (routine console chatter pops
     // the console window).
@@ -151,6 +153,8 @@ static std::vector<reasampler::ActionTableRow> buildMainActionTable() {
                     &RunResampleBake});
     rows.push_back({"EXPORT_BANK_PACKAGE", "export active bank as package",
                     &RunExportBankPackage});
+    rows.push_back({"IMPORT_BANK_PACKAGE", "import bank package (.rsbank)",
+                    &RunImportBankPackage});
     rows.push_back({"SHOW_VERSION", "show version", &RunShowVersion});
 
     return rows;