Add hometitle service: fuzzy matching engine and change detector FRE-5351

- matcher.service.ts: name/address normalization, Levenshtein distance,
  geocoding proximity, confidence scoring (0.0-1.0)
- change-detector.ts: PropertySnapshot diff engine, severity scoring
  (minor/moderate/major), configurable thresholds, alert triggering
- 57 unit tests with 98%+ coverage across all thresholds

services/hometitle/src/index.ts

@@ -0,0 +1,34 @@
+export {
+  matchRecords,
+  getConfigForPropertyType,
+  parseName,
+  normalizeString,
+  normalizeStreetType,
+  levenshteinDistance,
+  similarityScore,
+} from './matcher.service';
+
+export {
+  detectChanges,
+  shouldTriggerAlert,
+  classifyFieldChange,
+  determineSeverity,
+  computeChangeConfidence,
+} from './change-detector';
+
+export type {
+  PropertyRecord,
+  Address,
+  PropertyType,
+  PropertySnapshot,
+  MatchResult,
+  MatchDetails,
+  FieldMatch,
+  ChangeDetectionResult,
+  ChangeType,
+  Severity,
+  PropertyChange,
+  MatchingConfig,
+  DetectionConfig,
+  NormalizedTokens,
+} from './types';