Add v12.6 export sanity closeout handover

handover/workpackages/20260607_1515_v12_6_export_sanity_closeout.md

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+# Handover — WP3C — v12.6 Export sanity verification and closeout
+
+Repository: solidprivacy-nl/scrub  
+Workpackage title: WP3C — v12.6 Export sanity verification and closeout  
+Status: completed / administratively closed
+
+## Summary
+
+Administratively closed the v12.6 Export sanity checks workpackage. No code files were changed in this closeout. The closeout updated project control documentation to mark WP3/v12.6 as completed and recorded that the export sanity warning block is advisory only and does not change export/download semantics.
+
+## Files added
+
+- `handover/workpackages/20260607_1515_v12_6_export_sanity_closeout.md`
+
+## Files changed
+
+- `WORKPACKAGES.md`
+- `CHANGELOG.md`
+
+## Code files intentionally not changed
+
+- `export_sanity.py`
+- `tests/test_export_sanity.py`
+- `tests/test_export_sanity_ui_patch.py`
+- `fix_streamlit_nested_expanders.py`
+- `presidio_streamlit.py`
+- `review_summary.py`
+
+## Tests
+
+No tests were run by this closeout worker because WP3C was administrative only and no code was changed.
+
+Previously recorded evidence:
+
+- WP3A helper validation recorded: `PYTHONPATH=. pytest -q tests/test_export_sanity.py tests/test_review_summary.py` → 12 passed.
+- Coordinator reconciled helper verification: `Tests #58` green and `Sync to Hugging Face Space #72` green for commit `b0bf8ae`.
+- WP3B UI integration commits recorded:
+  - `c60b9b4bfa8944e620546ca26a4fe42c287edaa0` — Integrate export sanity warnings into UI patch.
+  - `f5158c9faf8e7676cb8403da0b42b0465539acfa` — Add export sanity UI patch tests.
+  - `7d043d13096518d5dca6a5f187189fa3a8471627` — Update workpackage status for export sanity UI.
+  - `4a84ddb7ca2b298ce2dcdcc5daf8b9f1cc055023` — Add export sanity UI handover.
+
+## Validation status
+
+- Documentation/control closeout: completed.
+- Code validation in WP3C: not applicable; no code was changed.
+- Export semantics: documented as unchanged.
+- Download blocking: documented as not introduced.
+
+## GitHub Actions status
+
+- Not queried successfully by this worker for new closeout commits.
+- Coordinator evidence for the earlier helper baseline is recorded as green.
+
+## Hugging Face sync status
+
+- Not queried successfully by this worker for new closeout commits.
+- Coordinator evidence for the earlier helper baseline is recorded as green.
+
+## App verification status
+
+- No app verification was performed by this closeout worker.
+- WP3C did not introduce UI or code changes.
+- Any visual verification of `Extra exportcontrole` remains tied to the earlier WP3B UI integration.
+
+## Remaining risks
+
+- This closeout assumes the coordinator instruction to start WP3C means the v12.6 line may be administratively closed.
+- Connector visibility into Actions/sync remains limited in this environment.
+- No new code validation was performed during closeout.
+
+## Next recommended step
+
+- Treat v12 Review UX as complete and start v13 Scrub Key JSON export UI only after coordinator approval. Keep v13 UI work sequential because it may touch the same review/export flow.