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/00_multiple_errors.sb

@@ -0,0 +1,30 @@
+// Multiple errors in one file
+// This demonstrates non-fail-fast error collection - all errors reported at once!
+
+character Martha {
+    age: 200
+    trust: 1.5
+    bond: -0.3
+}
+
+character David {
+    age: -5
+    love: 2.0
+}
+
+life_arc Growth {
+    state child {
+        on age > 18 -> adult
+    }
+
+    state adult {
+        on age > 65 -> senior
+        on retired -> elderly
+    }
+}
+
+schedule BadSchedule {
+    08:00 -> 12:00: work
+    11:30 -> 13:00: lunch
+    12:30 -> 17:00: more_work
+}

tests/compiler_errors/01_unexpected_token.sb

@@ -0,0 +1,6 @@
+// Error: Missing colon after field name
+// This demonstrates the UnexpectedToken parse error
+
+character Martha {
+    age 34
+}

tests/compiler_errors/05_trait_out_of_range.sb

@@ -0,0 +1,8 @@
+// Error: Trait value outside valid range
+// Demonstrates TraitOutOfRange validation error
+
+character Martha {
+    age: 34
+    trust: 1.5
+    bond: -0.2
+}

tests/compiler_errors/07_unknown_life_arc_state.sb

@@ -0,0 +1,12 @@
+// Error: Transition to undefined state
+// Demonstrates UnknownLifeArcState validation error
+
+life_arc Growth {
+    state child {
+        on age > 18 -> adult
+    }
+
+    state adult {
+        on age > 65 -> senior
+    }
+}

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
+}

tests/compiler_errors/README.md

@@ -0,0 +1,55 @@
+# Compiler Error Examples
+
+This directory contains example `.sb` files that demonstrate each type of error
+the Storybook compiler can detect. Each file is intentionally incorrect to showcase
+the error messages and helpful hints.
+
+## How to Run
+
+To see all error messages, validate each file individually:
+
+```bash
+# From the storybook root directory
+cargo build --release
+
+# Run each file to see its error
+./target/release/sb validate tests/compiler_errors/01_unexpected_token.sb
+./target/release/sb validate tests/compiler_errors/02_unexpected_eof.sb
+./target/release/sb validate tests/compiler_errors/03_invalid_token.sb
+# ... etc
+```
+
+Or use this script to show all errors:
+
+```bash
+#!/bin/bash
+for file in tests/compiler_errors/*.sb; do
+    echo "═══════════════════════════════════════════════════════════"
+    echo "File: $(basename $file)"
+    echo "═══════════════════════════════════════════════════════════"
+    cargo run --bin sb -- validate "$file" 2>&1 || true
+    echo ""
+done
+```
+
+## Error Categories
+
+### Parse Errors (Syntax)
+- `01_unexpected_token.sb` - Missing colon after field name
+- `02_unexpected_eof.sb` - Incomplete declaration
+- `03_invalid_token.sb` - Invalid character in syntax
+- `04_unclosed_prose.sb` - Prose block missing closing `---`
+
+### Validation Errors (Semantics)
+- `05_trait_out_of_range.sb` - Trait value outside 0.0-1.0 range
+- `06_age_out_of_range.sb` - Age value outside 0-150 range
+- `07_unknown_life_arc_state.sb` - Transition to undefined state
+- `08_schedule_overlap.sb` - Schedule blocks overlap in time
+- `09_unknown_behavior_action.sb` - Undefined behavior tree action
+- `10_duplicate_field.sb` - Same field name used twice
+- `11_relationship_bond_out_of_range.sb` - Bond value outside 0.0-1.0 range
+
+Each error includes:
+- ✓ Clear error message explaining what went wrong
+- ✓ Helpful hint on how to fix it
+- ✓ Context-specific suggestions

tests/compiler_errors/run_examples.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Script to run all compiler error examples and see the error messages
+
+cd "$(dirname "$0")/../.."
+
+echo "════════════════════════════════════════════════════════════════"
+echo "STORYBOOK COMPILER ERRORS - EXAMPLES"
+echo "════════════════════════════════════════════════════════════════"
+echo ""
+
+for file in tests/compiler_errors/*.sb; do
+    if [ -f "$file" ]; then
+        echo "═══════════════════════════════════════════════════════════════════"
+        echo "File: $(basename "$file")"
+        echo "═══════════════════════════════════════════════════════════════════"
+        cat "$file" | head -3 | tail -2  # Show the comment lines
+        echo ""
+        cargo run --quiet --bin sb -- validate "$file" 2>&1 || true
+        echo ""
+        echo ""
+    fi
+done
+
+echo "════════════════════════════════════════════════════════════════"
+echo "ALL EXAMPLES COMPLETE"
+echo "════════════════════════════════════════════════════════════════"