change-order-processor

# Change Order Processor ## Business Case ### Problem Statement Change orders cause project disruption: - Delayed processing affects cash flow - Unclear cost impact - Lost documentation - Schedule impacts not tracked ### Solution Streamlined change order processing with cost analysis, approval workflow, and impact tracking. ### Business Value - **Faster processing** - Reduce approval cycle time - **Cost control** - Accurate change pricing - **Documentation** - Complete audit trail - **Impact visibility** - Schedule and budget effects ## Technical Implementation ```python import pandas as pd from datetime import datetime, date, timedelta from typing import Dict, Any, List, Optional from dataclasses import dataclass, field from enum import Enum class ChangeOrderStatus(Enum): """Change order status.""" DRAFT = "draft" PENDING_REVIEW = "pending_review" PENDING_APPROVAL = "pending_approval" APPROVED = "approved" REJECTED = "rejected" VOID = "void" class ChangeType(Enum): """Type of change.""" OWNER_REQUESTED = "owner_requested" DESIGN_CHANGE = "design_change" FIELD_CONDITION = "field_condition" CODE_COMPLIANCE = "code_compliance" VALUE_ENGINEERING = "value_engineering" ERROR_OMISSION = "error_omission" class ImpactType(Enum): """Impact categories.""" COST_INCREASE = "cost_increase" COST_DECREASE = "cost_decrease" TIME_INCREASE = "time_increase" TIME_DECREASE = "time_decrease" NO_IMPACT = "n...