4.1 Generate a first draft of the modern code

Prompt

Using pilot_reporting_design.md and the COBOL programs listed in pilot_reporting_overview.md, generate initial implementation code under modern/<stack>/pilot that:
- Defines domain models and database entities for the key records and tables.
- Implements the core business logic in service classes, preserving behavior from COBOL paragraphs.
- Adds comments that reference the original COBOL paragraphs and copybooks.
- Treat this as a first draft for engineers to review.