refactor(parser): extract split() pipeline into named methods

Extract stripMaidenName, normalizeDotCompressed, stripAnnotation,
stripTitle, and splitByKnownLastNameOrFallback as individually
testable pipeline steps. Each extraction method is a pass-through
until its feature issue fills in the logic.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/main/java/org/raddatz/familienarchiv/service/PersonNameParser.java

@@ -118,35 +118,80 @@ public class PersonNameParser {
         return nameParts;
     }
 
+    // --- Pipeline result records (package-private for testing) ---
+
+    public record MaidenNameResult(String cleaned, String maidenName) {}
+    public record AnnotationResult(String cleaned, String annotation) {}
+    public record TitleResult(String cleaned, String title) {}
+    record NameParts(String firstName, String lastName) {}
+
     /**
-     * Splits a single full name string into firstName and lastName.
-     * Uses known last names first; falls back to splitting on the last space.
+     * Splits a single full name string into a structured SplitName.
+     * Pipeline: stripMaidenName → normalizeDotCompressed → stripAnnotation → stripTitle → splitByKnownLastNameOrFallback
      */
     public static SplitName split(String rawName) {
         if (rawName == null || rawName.isBlank()) {
             return new SplitName(null, "?", "?", null, null);
         }
 
-        String cleaned = GEB_PATTERN.matcher(rawName).replaceAll("").trim();
+        MaidenNameResult maiden = stripMaidenName(rawName);
+        String cleaned = maiden.cleaned();
 
-        // Normalize dot-compressed names: "Dr.Fr.Zarncke" -> "Dr. Fr. Zarncke"
-        if (!cleaned.contains(" ") && cleaned.contains(".")) {
-            cleaned = cleaned.replace(".", ". ").trim();
+        cleaned = normalizeDotCompressed(cleaned);
+
+        AnnotationResult paren = stripAnnotation(cleaned);
+        cleaned = paren.cleaned();
+
+        TitleResult title = stripTitle(cleaned);
+        cleaned = title.cleaned();
+
+        NameParts parts = splitByKnownLastNameOrFallback(cleaned);
+
+        return new SplitName(
+                title.title(), parts.firstName(), parts.lastName(),
+                maiden.maidenName(), paren.annotation()
+        );
+    }
+
+    /** Strips "geb. Xxx" maiden-name annotations. Pass-through until #209. */
+    public static MaidenNameResult stripMaidenName(String input) {
+        String cleaned = GEB_PATTERN.matcher(input).replaceAll("").trim();
+        return new MaidenNameResult(cleaned, null);
+    }
+
+    /** Normalizes dot-compressed names: "Dr.Fr.Zarncke" → "Dr. Fr. Zarncke" */
+    static String normalizeDotCompressed(String input) {
+        if (!input.contains(" ") && input.contains(".")) {
+            return input.replace(".", ". ").trim();
         }
+        return input;
+    }
 
+    /** Strips parenthesized annotations. Pass-through until #210. */
+    public static AnnotationResult stripAnnotation(String input) {
+        return new AnnotationResult(input, null);
+    }
+
+    /** Strips title prefixes. Pass-through until #212. */
+    public static TitleResult stripTitle(String input) {
+        return new TitleResult(input, null);
+    }
+
+    /** Splits a cleaned name into firstName/lastName using known last names or last-space fallback. */
+    static NameParts splitByKnownLastNameOrFallback(String cleaned) {
         String lastName = findKnownLastName(cleaned);
         if (lastName != null) {
             String firstName = cleaned.substring(0, cleaned.length() - lastName.length()).trim();
             if (firstName.isBlank()) firstName = cleaned;
-            return new SplitName(null, firstName, lastName, null, null);
+            return new NameParts(firstName, lastName);
         }
 
         int lastSpace = cleaned.lastIndexOf(' ');
         if (lastSpace > 0) {
-            return new SplitName(null, cleaned.substring(0, lastSpace).trim(), cleaned.substring(lastSpace + 1).trim(), null, null);
+            return new NameParts(cleaned.substring(0, lastSpace).trim(), cleaned.substring(lastSpace + 1).trim());
         }
 
-        return new SplitName(null, cleaned, "?", null, null);
+        return new NameParts(cleaned, "?");
     }
 
     /** Returns the known last name that the given string ends with, or null. */

backend/src/test/java/org/raddatz/familienarchiv/service/PersonNameParserTest.java

@@ -256,4 +256,27 @@ class PersonNameParserTest {
         List<String> result = PersonNameParser.parseReceivers("Müller und Herbert de Gruyter");
         assertThat(result).containsExactlyInAnyOrder("Müller", "Herbert de Gruyter");
     }
+
+    // --- pipeline pass-through methods ---
+
+    @Test
+    void stripMaidenName_isPassthrough() {
+        PersonNameParser.MaidenNameResult result = PersonNameParser.stripMaidenName("Walter de Gruyter");
+        assertThat(result.cleaned()).isEqualTo("Walter de Gruyter");
+        assertThat(result.maidenName()).isNull();
+    }
+
+    @Test
+    void stripAnnotation_isPassthrough() {
+        PersonNameParser.AnnotationResult result = PersonNameParser.stripAnnotation("Walter de Gruyter");
+        assertThat(result.cleaned()).isEqualTo("Walter de Gruyter");
+        assertThat(result.annotation()).isNull();
+    }
+
+    @Test
+    void stripTitle_isPassthrough() {
+        PersonNameParser.TitleResult result = PersonNameParser.stripTitle("Walter de Gruyter");
+        assertThat(result.cleaned()).isEqualTo("Walter de Gruyter");
+        assertThat(result.title()).isNull();
+    }
 }