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/characters/henry.sb

@@ -0,0 +1,29 @@
+//! Henry - Loyal customer and retired teacher
+//!
+//! Demonstrates:
+//! - Non-family character in the community
+//! - Minimal template usage (Person, no work schedule)
+//! - Community connection through the bakery
+
+use schema::templates::Person;
+
+character Henry from Person {
+    // Personal details
+    age: 68
+
+    // General traits
+    energy: 0.5
+    mood: 0.75
+
+    ---backstory
+    Henry taught history at the local school for over forty years before
+    retiring. He has been a daily customer at the bakery since Martha
+    first opened its doors. Every morning at precisely seven o'clock,
+    he arrives for a sourdough loaf and a chat.
+
+    He watched Emma grow up and occasionally helps her with her homework
+    when he stops by. The bakery is his anchor to the community now that
+    he no longer teaches. Martha always sets aside his favorite loaf,
+    and Jane saves him a croissant on Saturdays.
+    ---
+}