feat: implement storybook DSL with template composition and validation

Add complete domain-specific language for authoring narrative content for
agent simulations.

Features:
- Complete parser using LALRPOP + logos lexer
- Template composition (includes + multiple inheritance)
- Strict mode validation for templates
- Reserved keyword protection
- Semantic validators (trait ranges, schedule overlaps, life arcs, behaviors)
- Name resolution and cross-reference tracking
- CLI tool (validate, inspect, query commands)
- Query API with filtering
- 260 comprehensive tests (unit, integration, property-based)

Implementation phases:
- Phase 1 (Parser): Complete
- Phase 2 (Resolution + Validation): Complete
- Phase 3 (Public API + CLI): Complete

BREAKING CHANGE: Initial implementation

tests/examples/field_access.sb

@@ -0,0 +1,113 @@
+// Test field access in relationship contexts
+
+relationship Marriage {
+    PersonA as spouse
+    PersonB as spouse
+    
+    self {
+        bond: 0.8
+    }
+    other {
+        bond: 0.8
+    }
+}
+
+life_arc RelationshipDynamics {
+    state stable {
+        // Field access with comparisons
+        on self.bond < 0.3 -> troubled
+        on other.bond < 0.3 -> troubled
+        on self.bond > 0.9 and other.bond > 0.9 -> thriving
+    }
+    
+    state troubled {
+        on self.bond > 0.7 and other.bond > 0.7 -> stable
+        on self.bond < 0.1 or other.bond < 0.1 -> broken
+    }
+    
+    state thriving {
+        on self.bond < 0.8 or other.bond < 0.8 -> stable
+    }
+    
+    state broken {
+        on self.bond > 0.5 and other.bond > 0.5 -> troubled
+    }
+}
+
+life_arc CharacterStates {
+    state monitoring {
+        // Field access with self
+        on self.age > 18 -> adult
+        on self.energy < 0.2 -> exhausted
+        on self.health < 30 -> sick
+        
+        // Field access with equality
+        on self.status is active -> active_state
+        on self.ready is true -> ready_state
+    }
+    
+    state adult {
+        on self.age < 18 -> monitoring
+    }
+    
+    state exhausted {
+        on self.energy > 0.7 -> monitoring
+    }
+    
+    state sick {
+        on self.health > 80 -> monitoring
+    }
+    
+    state active_state {
+        on self.status is inactive -> monitoring
+    }
+    
+    state ready_state {
+        on self.ready is false -> monitoring
+    }
+}
+
+life_arc ComplexFieldAccess {
+    state checking {
+        // Nested field access patterns
+        on self.stats.health > 50 -> healthy
+        on other.profile.age < 18 -> young_other
+        
+        // Field access with logical operators
+        on self.energy > 0.5 and self.health > 70 -> strong
+        on not self.ready -> waiting
+        on self.completed is true or other.completed is true -> done
+        
+        // Mixed field access and regular identifiers
+        on self.score > threshold -> passed
+        on other.level is beginner and difficulty > 5 -> too_hard
+    }
+    
+    state healthy {
+        on self.stats.health < 30 -> checking
+    }
+    
+    state young_other {
+        on other.profile.age >= 18 -> checking
+    }
+    
+    state strong {
+        on self.energy < 0.3 or self.health < 50 -> checking
+    }
+    
+    state waiting {
+        on self.ready -> checking
+    }
+    
+    state done {
+        on self.completed is false and other.completed is false -> checking
+    }
+    
+    state passed {
+        on self.score < threshold -> checking
+    }
+    
+    state too_hard {
+        on other.level is advanced or difficulty < 3 -> checking
+    }
+}