Initial commit: JDE Scoping Tool migration project

Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.

DOCUMENTATION/Architecture/DataFlow.md

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+# Data Flow
+
+The system has two primary data flows: search execution and data synchronization.
+
+## Search Flow
+
+The search flow mirrors the legacy pattern, modernized for ASP.NET Core:
+
+```
+1. User submits search via Blazor UI
+   └─> POST /api/search (SearchCriteria JSON)
+
+2. SearchController validates and stores in SQL Server
+   └─> Search record created with Status = "Queued"
+   └─> Returns SearchId to client
+
+3. Client connects to SignalR StatusHub
+   └─> Subscribes to updates for their SearchId
+
+4. SearchProcessorService (BackgroundService) polls
+   └─> Finds queued searches
+   └─> Executes query against local cache
+   └─> Generates Excel via ClosedXML
+   └─> Stores result in Search.Results (VARBINARY)
+   └─> Updates Status = "Complete"
+
+5. StatusHub pushes update to client
+   └─> Client shows "Complete" status
+
+6. User clicks download
+   └─> GET /api/search/{id}/download
+   └─> Returns Excel file stream
+```
+
+## Search Status States
+
+| Status | Description |
+|--------|-------------|
+| `Queued` | Search submitted, waiting for processing |
+| `Processing` | Background service is executing the search |
+| `Generating` | Query complete, generating Excel file |
+| `Complete` | Excel ready for download |
+| `Failed` | Error occurred during processing |
+
+## Data Sync Flow
+
+The `DataSyncService` runs on a schedule to keep the local SQL Server cache current:
+
+```
+DataSyncService runs on schedule:
+├── Mass refresh: Full reload (weekly or manual trigger)
+├── Daily refresh: Last 24-48 hours of changes
+└── Hourly refresh: Incremental updates
+
+Each sync:
+1. Determine tables to sync based on schedule
+2. Query JDE/CMS Oracle for changes since last sync
+3. Bulk insert/update to SQL Server cache
+4. Update DataUpdate table with timestamp
+```
+
+## Sync Schedules
+
+| Schedule | Frequency | Scope |
+|----------|-----------|-------|
+| Mass | Weekly (Sunday 2 AM) or manual | Full reload of all cached tables |
+| Daily | Daily (3 AM) | Changes from last 48 hours |
+| Hourly | Every hour | Incremental changes since last sync |
+
+The schedules are configured via cron expressions in `appsettings.json` and parsed using the Cronos library.
+
+## Database Connections
+
+| Database | Purpose | Driver |
+|----------|---------|--------|
+| SQL Server | Local cache, search storage | Microsoft.Data.SqlClient |
+| JDE Oracle | Enterprise work order data | Oracle.ManagedDataAccess.Core |
+| CMS Oracle | Enterprise CMS data (migrated from Sybase) | Oracle.ManagedDataAccess.Core |
+
+## Related Documentation
+
+- [Host Project](./HostProject.md)
+- [Core Project](./CoreProject.md)
+- [Configuration](./Configuration.md)