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

examples/baker-family/schema/types.sb

@@ -33,9 +33,19 @@ sub_concept SkillLevel.Tier {
     Master
 }
 
-// Concept comparison - compile-time mapping of skill tiers to defaults
+// Concept comparison - compile-time mapping of skill tiers to quality expectations
+// An Apprentice can produce any quality; a Master must produce fresh goods
 concept_comparison SkillLevel {
-    Apprentice: { baking_skill: any },
-    Journeyman: { baking_skill: any },
-    Master: { baking_skill: any }
+    Apprentice: {
+        baking_skill: Tier is Apprentice,
+        freshness: any
+    },
+    Journeyman: {
+        baking_skill: Tier is Journeyman,
+        freshness: any
+    },
+    Master: {
+        baking_skill: Tier is Master,
+        freshness: Tier is Master
+    }
 }