12-task TDD implementation plan covering:
- MapOrdinal interface and binary method overrides
- ColumnDropTransformer and JdeDateTransformer ordinal mapping
- JDE date validation with 1900-01-01 sentinel
- Column rename collision detection
- SqlScriptRunner parameters support
- CommonScripts with ParseTableName and QUOTENAME
- Destination command timeouts
- Column mapping with destination schema intersection
- EtlPipelineBuilder.WithCommandTimeout validation
- Full test suite verification
- Codex MCP final review
Move configuration options from Core/DataAccess/DataSync/ExcelIO to
dedicated Options folders within each project for better organization.
Update all references and tests accordingly.
Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.