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/comparisons.sb

@@ -0,0 +1,34 @@
+// Test comparison expressions in life arcs
+
+life_arc AgeProgression {
+    state child {
+        on age > 12 -> teen
+    }
+    state teen {
+        on age >= 18 -> adult
+    }
+    state adult {
+        on age > 65 -> senior
+    }
+}
+
+life_arc EnergyStates {
+    state rested {
+        on energy < 0.3 -> tired
+    }
+    state tired {
+        on energy <= 0.1 -> exhausted
+    }
+    state exhausted {
+        on energy >= 0.5 -> rested
+    }
+}
+
+life_arc HealthStates {
+    state healthy {
+        on health < 50 -> sick
+    }
+    state sick {
+        on health >= 80 -> healthy
+    }
+}