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/emma.sb

@@ -20,16 +20,17 @@ character Emma from Child {
     mood: 0.85
 
     ---backstory
-    Emma is the bright, energetic daughter of Martha and John. She loves
+    Emma is the bright, energetic daughter of Martha and Jane. She loves
     helping in the bakery on weekends, though she's not allowed to work
     the ovens yet. She's fascinated by the chemistry of baking and often
-    asks her parents endless questions about why dough rises, how yeast
+    asks her mothers endless questions about why dough rises, how yeast
     works, and what makes bread crusty.
 
     At school, she excels in science and math, and dreams of one day
-    creating her own innovative recipes. For now, she's content to help
-    package goods and chat with the regular customers who've watched her
-    grow up.
+    creating her own innovative recipes. She learns the science of bread
+    from Martha and the art of decoration from Jane. For now, she's
+    content to help package goods and chat with the regular customers
+    who've watched her grow up.
     ---
 }
 

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.
+    ---
+}

examples/baker-family/characters/jane.sb

@@ -15,6 +15,7 @@ character Jane from Baker {
     specialty: "pastries"
     baking_skill: 0.85
     customer_relations: 0.80
+    skill_tier: Journeyman
 
     // General traits
     energy: 0.75
@@ -26,13 +27,13 @@ character Jane from Baker {
 
     ---backstory
     Jane trained at a culinary school in the capital before returning
-    to his hometown and meeting Martha. His specialty is delicate
+    to her hometown and meeting Martha. Her specialty is delicate
     pastries and elaborate wedding cakes. While Martha handles the
     bread and business, Jane focuses on the artistic creations that
     draw customers from neighboring towns.
 
-    He's more of a night owl by nature, but has adapted to the baker's
-    early schedule over the years. His croissants are legendary.
+    She is more of a night owl by nature, but has adapted to the baker's
+    early schedule over the years. Her croissants are legendary.
     ---
 }
 

examples/baker-family/characters/martha.sb

@@ -15,6 +15,7 @@ character Martha from Baker {
     specialty: "sourdough"
     baking_skill: 0.9
     customer_relations: 0.95
+    skill_tier: Master
 
     // General traits (inherited from Person template)
     energy: 0.7

examples/baker-family/characters/roland.sb

@@ -0,0 +1,40 @@
+//! Roland - Competing baker from the next town
+//!
+//! Demonstrates:
+//! - Rival/competitor character
+//! - Same template (Baker) with different values
+//! - Concept comparison usage with skill_tier
+
+use schema::templates::Baker;
+
+character Roland from Baker {
+    // Personal details
+    age: 42
+
+    // Baker-specific traits
+    specialty: "rye bread"
+    baking_skill: 0.75
+    customer_relations: 0.60
+    skill_tier: Journeyman
+
+    // General traits
+    energy: 0.80
+    mood: 0.65
+
+    // Work ethic
+    work_ethic: 0.80
+    occupation: "baker"
+
+    ---backstory
+    Roland runs a bakery in the neighboring town. He learned baking from
+    his father and considers himself the rightful best baker in the region.
+    His rye bread is excellent, but he lacks Martha's warmth with customers
+    and Jane's artistic flair.
+
+    He sees Martha's bakery as his chief competition and often tries to
+    undercut her prices at the market. Despite the rivalry, there is a
+    grudging respect between them. Roland once admitted, after too much
+    ale at the harvest festival, that Martha's sourdough was better than
+    his own.
+    ---
+}