/validate

Validate specification against schema and quality rules.

# Validate Specification

Validate a specification against the canonical schema and quality rules.

## Workflow

1. **Load Specification**
   - Read the specification file
   - Parse YAML frontmatter and content

2. **Schema Validation**
   - Spawn `spec-validator` agent
   - Check required fields present
   - Validate field formats
   - Check requirement ID patterns

3. **EARS Pattern Validation**
   - Verify all requirements use EARS format
   - Check pattern syntax correctness
   - Identify malformed requirements

4. **Acceptance Criteria Validation**
   - Verify all requirements have ac...