feat(imports): verify Sure NDJSON import readback (#1869)

* feat(imports): verify Sure NDJSON readback

* fix(imports): tighten Sure readback verification

* fix(imports): polish Sure verification review nits

docs/api/openapi.yaml

@@ -1733,6 +1733,72 @@ components:
         unassigned_mappings_count:
           type: integer
           minimum: 0
+    ImportVerificationReadback:
+      type: object
+      description: SureImport only. Expected NDJSON counts compared to family-scoped
+        database readback after publish.
+      properties:
+        status:
+          type: string
+          enum:
+          - not_verified
+          - matched
+          - mismatch
+          - failed
+          - reverted
+        checked_at:
+          type: string
+          format: date-time
+          nullable: true
+        expected_record_counts:
+          type: object
+          additionalProperties:
+            type: integer
+        before_counts:
+          type: object
+          additionalProperties:
+            type: integer
+        after_counts:
+          type: object
+          additionalProperties:
+            type: integer
+        actual_delta_counts:
+          type: object
+          additionalProperties:
+            type: integer
+        checked_counts:
+          type: object
+          additionalProperties:
+            type: integer
+        mismatches:
+          type: object
+          additionalProperties:
+            type: object
+            required:
+            - expected
+            - actual
+            properties:
+              expected:
+                type: integer
+              actual:
+                type: integer
+        error:
+          type: string
+          nullable: true
+    ImportVerification:
+      type: object
+      description: SureImport only. Captured at upload and completed after import
+        publish.
+      required:
+      - expected_record_counts
+      - readback
+      properties:
+        expected_record_counts:
+          type: object
+          additionalProperties:
+            type: integer
+        readback:
+          "$ref": "#/components/schemas/ImportVerificationReadback"
     ImportPreflightContent:
       type: object
       required:
@@ -1975,6 +2041,8 @@ components:
           "$ref": "#/components/schemas/ImportConfiguration"
         stats:
           "$ref": "#/components/schemas/ImportStats"
+        verification:
+          "$ref": "#/components/schemas/ImportVerification"
     ImportCollection:
       type: object
       required:
@@ -4753,7 +4821,7 @@ paths:
     get:
       summary: Retrieve an import
       description: Retrieve detailed information about a specific import, including
-        configuration and row statistics.
+        configuration, row statistics, and SureImport readback verification when available.
       tags:
       - Imports
       security: