test(person): address PR #736 review nits

- AC-3 cascade test: assert an innocent bystander's mention row survives the
  delete, proving the cascade is scoped to the deleted person (Nora).
- Fix integration-test comment: receivers is @ManyToMany(LAZY), not an EAGER
  @ElementCollection (Sara).
- ADR-032: note the @ prefix is kept in the degraded path, stripped in live
  mentions (Leonie).
- Add trailing newline to PersonRepository.java (Felix).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/test/java/org/raddatz/familienarchiv/person/PersonRepositoryTest.java

@@ -776,6 +776,7 @@ class PersonRepositoryTest {
         // AC-3: the @-mention sidecar is a CASCADE soft reference, but the literal "@Name" lives
         // in transcription_blocks.text and must stay visible as plain text after the person goes.
         Person mentioned = personRepository.save(Person.builder().firstName("Auguste").lastName("Raddatz").build());
+        Person survivor = personRepository.save(Person.builder().firstName("Clara").lastName("Cram").build());
         Document doc = documentRepository.save(Document.builder()
                 .title("Brief").originalFilename("brief.pdf")
                 .status(DocumentStatus.UPLOADED).build());
@@ -790,12 +791,18 @@ class PersonRepositoryTest {
         entityManager.createNativeQuery(
                 "INSERT INTO transcription_blocks (id, annotation_id, document_id, text) VALUES (?1, ?2, ?3, ?4)")
                 .setParameter(1, blockId).setParameter(2, annotationId).setParameter(3, doc.getId())
-                .setParameter(4, "Brief an @Auguste Raddatz").executeUpdate();
+                .setParameter(4, "Brief an @Auguste Raddatz und @Clara Cram").executeUpdate();
+        // Two mention rows on the same block: the deleted person and an innocent bystander.
         entityManager.createNativeQuery(
                 "INSERT INTO transcription_block_mentioned_persons (block_id, person_id, display_name) "
                         + "VALUES (?1, ?2, ?3)")
                 .setParameter(1, blockId).setParameter(2, mentioned.getId())
                 .setParameter(3, "Auguste Raddatz").executeUpdate();
+        entityManager.createNativeQuery(
+                "INSERT INTO transcription_block_mentioned_persons (block_id, person_id, display_name) "
+                        + "VALUES (?1, ?2, ?3)")
+                .setParameter(1, blockId).setParameter(2, survivor.getId())
+                .setParameter(3, "Clara Cram").executeUpdate();
         entityManager.flush();
         entityManager.clear();
 
@@ -808,9 +815,15 @@ class PersonRepositoryTest {
                 .setParameter(1, mentioned.getId()).getSingleResult();
         assertThat(mentionRows.longValue()).isZero();
 
+        // The cascade is scoped to the deleted person — the bystander's mention row is untouched.
+        Number survivorRows = (Number) entityManager.createNativeQuery(
+                "SELECT count(*) FROM transcription_block_mentioned_persons WHERE person_id = ?1")
+                .setParameter(1, survivor.getId()).getSingleResult();
+        assertThat(survivorRows.longValue()).isEqualTo(1);
+
         String text = (String) entityManager.createNativeQuery(
                 "SELECT text FROM transcription_blocks WHERE id = ?1")
                 .setParameter(1, blockId).getSingleResult();
-        assertThat(text).isEqualTo("Brief an @Auguste Raddatz");
+        assertThat(text).isEqualTo("Brief an @Auguste Raddatz und @Clara Cram");
     }
 }

backend/src/test/java/org/raddatz/familienarchiv/person/PersonServiceIntegrationTest.java

@@ -205,7 +205,7 @@ class PersonServiceIntegrationTest {
 
         // The ON DELETE cascade fires beneath Hibernate — flush the delete and clear the L1
         // cache so the asserting reads observe the post-delete database state, not stale
-        // managed entities (the EAGER @ElementCollection on receivers makes this load-bearing).
+        // managed entities still holding the dropped sender/receiver associations.
         entityManager.flush();
         entityManager.clear();
 

docs/adr/032-person-delete-db-level-integrity.md

@@ -45,7 +45,9 @@ letters. This is pinned by a non-negotiable document-survival assertion in
   stay thin (`deleteById` + the cascade); `reassignSenderToNull` and `deleteReceiverReferences`
   are deleted.
 - This *fixes* the pre-existing dead-link-on-deleted-person case — it is not a purely
-  invisible refactor.
+  invisible refactor. Note the read renderer strips the `@` prefix when it emits a live
+  mention link, but the degraded (deleted-person) path leaves the literal `@Name` in the
+  block text as-is — the reader sees `@Auguste Raddatz` as plain text, never a dead link.
 - DB cascades run below `AuditService`, so the row-level cleanup is intentionally not
   audit-logged; the person-delete action itself is still logged at the service layer.
 - The V71 FK validation requires cleaning pre-existing orphan mention rows first; the