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/compiler_errors/08_schedule_overlap.sb

@@ -0,0 +1,8 @@
+// Error: Schedule blocks overlap in time
+// Demonstrates ScheduleOverlap validation error
+
+schedule DailyRoutine {
+    08:00 -> 12:30: work
+    12:00 -> 13:00: lunch
+    13:00 -> 17:00: work
+}