Planning System Validation

Consistency checking and auto-repair for project containers.

Key Classes

Class	Purpose
ConsistencyChecker	5-rule validation with optional auto-repair
ValidationResult	Result dataclass with errors, warnings, and repaired flag

Validation Rules

1. Parent references point to existing items
2. Child references point to existing items
3. Bidirectional parent-child consistency
4. No circular references in hierarchy
5. Dependency references point to existing items

Notes

• repair_broken_references() clears broken refs and stores originals in item metadata
• Validation runs automatically on project load