feat(planner): add bridge target version strategy for auto-stamping ledger to app versions

test/test.basic.ts

@@ -145,6 +145,21 @@ tap.test('constructor: rejects s3 backend without bucket', async () => {
   expect(caught!.code).toEqual('LEDGER_BACKEND_MISMATCH');
 });
 
+tap.test('constructor: rejects invalid targetVersionStrategy', async () => {
+  let caught: SmartMigrationError | undefined;
+  try {
+    new SmartMigration({
+      targetVersion: '1.0.0',
+      db: {} as any,
+      targetVersionStrategy: 'loose' as any,
+    });
+  } catch (err) {
+    caught = err as SmartMigrationError;
+  }
+  expect(caught).toBeInstanceOf(SmartMigrationError);
+  expect(caught!.code).toEqual('INVALID_TARGET_VERSION_STRATEGY');
+});
+
 tap.test('step(): rejects empty id', async () => {
   const m = new SmartMigration({ targetVersion: '1.0.0', db: {} as any });
   expect(() => m.step('')).toThrow();