Add Purple Envelope proofing report text file and document status pipeline

Generates a low-to-high sorted precinct ballot proofing report alongside
the PDF proof, with ballot/page totals. Documents the Kit status pipeline
in the README for the import service.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -97,6 +97,15 @@ And a helper installer:
 
 These are intended to run on Windows to import tracking export data from the configured `ExportDirectory`.
 
+### Purple Envelope kit status pipeline
+`TrackingDataImport.vbs` drives a Purple Envelope kit through its `Kit.Status` values on each run, via `ProcessStatus` in `Main`:
+
+1. **Ready To Assign STIDS** — user picks the outbound STID on the Kit edit page (`SwitchBoardPurpleEnvelopeEdit`)
+2. **Ready to Assign Labels** — set by `SwitchBoardPurpleEnvelopeEditPost`; picked up by `AssignTracking`, which assigns serial numbers/tracking info (`createTrackingInfoForKit`)
+3. **Ready For Export** — picked up by `ExportSnailWorks`, which builds the SnailWorks CSV export (`CreateExportForSnailWorks`)
+4. **Ready to Proof** — picked up by `ProofJurisdiction`, which builds the PDF proof and proofing report (`CreateProofForJurisdiction`)
+5. **Ready For Inkjet Export** — picked up by `ExportInkjet`, which writes the inkjet CSV (`ExportInkjetFile`) and sets status to **Done**
+
 ---
 
 ## Dev tooling