Fix Bug #12 (2/2): Zweite Validierungsstelle in TargetFilenameBuildingService angepasst

- TargetFilenameBuildingService.isAllowedTitleCharacters() erlaubt jetzt Bindestrich (-)
- Fehlermeldung nach Windows-Cleaning aktualisiert
- JavaDoc aktualisiert
- Test TargetFilenameBuildingServiceTest.buildBaseFilename_titleWithHyphen angepasst
- Test DocumentProcessingCoordinatorTest angepasst (Bindestrich → Ausrufezeichen)
- Vollständiger Reactor-Build grün: mvn clean verify

pdf-umbenenner-application/src/main/java/de/gecheckt/pdf/umbenenner/application/service/TargetFilenameBuildingService.java

@@ -93,7 +93,7 @@ public final class TargetFilenameBuildingService {
      *   <li>Validated title must be non-null and non-blank.</li>
      *   <li>Validated title must not exceed the configured maximum length
      *       (before Windows cleaning).</li>
-     *   <li>After Windows-character cleaning, title must contain only letters, digits, and spaces.</li>
+     *   <li>After Windows-character cleaning, title must contain only letters, digits, spaces, and hyphens.</li>
      * </ul>
      * If any rule is violated, the state is treated as an
      * {@link InconsistentProposalState}.
@@ -148,11 +148,11 @@ public final class TargetFilenameBuildingService {
                             + title + "'");
         }
 
-        // After cleaning, verify that only letters, digits, and spaces remain
+        // After cleaning, verify that only letters, digits, spaces, and hyphens remain
         if (!isAllowedTitleCharacters(cleanedTitle)) {
             return new InconsistentProposalState(
                     "After Windows-compatibility cleaning, title contains disallowed characters "
-                            + "(only letters, digits, and spaces are permitted): '"
+                            + "(only letters, digits, spaces, and hyphens are permitted): '"
                             + cleanedTitle + "'");
         }
 
@@ -166,13 +166,13 @@ public final class TargetFilenameBuildingService {
     // -------------------------------------------------------------------------
 
     /**
-     * Returns {@code true} if every character in the title is a letter, a digit, or a space.
+     * Returns {@code true} if every character in the title is a letter, a digit, space, or hyphen.
      * Unicode letters (including German Umlauts and ß) are permitted.
      */
     private static boolean isAllowedTitleCharacters(String title) {
         for (int i = 0; i < title.length(); i++) {
             char c = title.charAt(i);
-            if (!Character.isLetter(c) && !Character.isDigit(c) && c != ' ') {
+            if (!Character.isLetter(c) && !Character.isDigit(c) && c != ' ' && c != '-') {
                 return false;
             }
         }

pdf-umbenenner-application/src/test/java/de/gecheckt/pdf/umbenenner/application/service/DocumentProcessingCoordinatorTest.java

@@ -978,14 +978,14 @@ class DocumentProcessingCoordinatorTest {
         DocumentRecord existingRecord = buildRecord(ProcessingStatus.PROPOSAL_READY, FailureCounters.zero());
         recordRepo.setLookupResult(new DocumentKnownProcessable(existingRecord));
 
-        // Hyphen is a disallowed character in the fachliche Titelregel
+        // Exclamation mark is a disallowed character in the fachliche Titelregel
         ProcessingAttempt badProposal = new ProcessingAttempt(
                 fingerprint, context.runId(), 1, Instant.now(), Instant.now(),
                 ProcessingStatus.PROPOSAL_READY, null, null, false,
                 null,
                 "model", "prompt", 1, 100, "{}", "reason",
                 LocalDate.of(2026, 1, 15), DateSource.AI_PROVIDED,
-                "Rechnung-2026", null);
+                "Rechnung!", null);
         attemptRepo.savedAttempts.add(badProposal);
 
         boolean result = processor.processDeferredOutcome(candidate, fingerprint, context, attemptStart, c -> null);

pdf-umbenenner-application/src/test/java/de/gecheckt/pdf/umbenenner/application/service/TargetFilenameBuildingServiceTest.java

@@ -212,15 +212,15 @@ class TargetFilenameBuildingServiceTest {
     // -------------------------------------------------------------------------
 
     @Test
-    void buildBaseFilename_titleWithHyphen_returnsInconsistentProposalState() {
-        // Hyphens are not letters, digits, or spaces — disallowed by fachliche Titelregel
+    void buildBaseFilename_titleWithHyphen_succeeds() {
+        // Hyphens are allowed per fachliche Titelregel
         ProcessingAttempt attempt = proposalAttempt(LocalDate.of(2026, 1, 1), "Rechnung-2026");
 
         BaseFilenameResult result = TargetFilenameBuildingService.buildBaseFilename(attempt, TEST_MAX_TITLE_LENGTH);
 
-        assertThat(result).isInstanceOf(InconsistentProposalState.class);
-        assertThat(((InconsistentProposalState) result).reason())
-                .contains("disallowed characters");
+        assertThat(result).isInstanceOf(BaseFilenameReady.class);
+        assertThat(((BaseFilenameReady) result).baseFilename())
+                .isEqualTo("2026-01-01 - Rechnung-2026.pdf");
     }
 
     @Test