feat(examples): expand baker-family with relationships and world context

Added comprehensive v0.3.0 feature demonstration:

Characters (5 total):
- Martha & Jane (married lesbian couple, co-owners of bakery)
- Emma (their daughter, apprentice baker)
- Henry (loyal customer, retired teacher)
- Roland (competing baker)

New declarations:
- 6 relationships with asymmetric perspectives (Marriage, ParentChild×2,
  BusinessPartnership, CustomerRelationship, Competition)
- Locations with prose (MarthasBakery, MainStreet)
- Institution (BakersGuild)
- Life arcs (MarriageQuality, BusinessGrowth)

Features demonstrated:
- Concept comparison usage (skill_tier: Master/Journeyman)
- Life arc applied to relationship
- Asymmetric participant perspectives
- Family coherence across files

tests/validate_examples.rs

@@ -34,9 +34,9 @@ fn load_example(name: &str) -> Project {
 fn test_baker_family_loads_successfully() {
     let project = load_example("baker-family");
 
-    // Should have exactly 3 characters
+    // Should have exactly 5 characters
     let char_count = project.characters().count();
-    assert_eq!(char_count, 3, "Baker family should have 3 characters");
+    assert_eq!(char_count, 5, "Baker family should have 5 characters");
 
     // Verify all characters exist
     assert!(
@@ -51,6 +51,14 @@ fn test_baker_family_loads_successfully() {
         project.find_character("Emma").is_some(),
         "Emma should exist"
     );
+    assert!(
+        project.find_character("Henry").is_some(),
+        "Henry should exist"
+    );
+    assert!(
+        project.find_character("Roland").is_some(),
+        "Roland should exist"
+    );
 }
 
 #[test]