printedparts: QR label with gage tag + revision; record taken rev

Label switches from CODE128 to a QR encoding 'TAG|rev' (gage lab tag + latest
print-file revision), so a physical part carries which revision it was printed
from - short payload stays low-version + reliable at 0.5in (margin quiet zone,
EC M, no logo). Item exposes latestrevision; kiosk strips the |rev to resolve
and records the scanned revision on the take (migration 0004 adds
printeditemtransactions.revision) for traceability of which rev was consumed.
Manual entry records a null revision.

plugins/printedparts/api/routes.py

@@ -266,7 +266,8 @@ from ..models import PrintedItemTransaction
 from ..services.badges import BadgeError, resolve_badge
 
 
-def _ledger_write(item, transactiontype, quantitychange, sso, name, reason=None):
+def _ledger_write(item, transactiontype, quantitychange, sso, name, reason=None,
+                  revision=None):
     """Append a ledger row and move the cached quantity in ONE commit.
 
     The single-commit invariant is what keeps quantityonhand equal to the
@@ -284,6 +285,7 @@ def _ledger_write(item, transactiontype, quantitychange, sso, name, reason=None)
         employeesso=sso,
         employeename=name,
         reason=reason,
+        revision=revision,
     ))
     db.session.commit()
     if (quantitychange < 0
@@ -413,8 +415,10 @@ def _kiosk_find_item(itemcode):
     """Resolve a scanned or typed code to an active item.
 
     Accepts the full code (WJRP0042) or bare digits from the touch keypad
-    (42 -> prefix + zero-pad), so manual entry never needs letters."""
-    scanned = (itemcode or '').strip().upper()
+    (42 -> prefix + zero-pad), so manual entry never needs letters. A label QR
+    carries 'TAG|rev'; the revision is stripped here (it identifies the physical
+    part's file rev, not a different item)."""
+    scanned = (itemcode or '').split('|', 1)[0].strip().upper()
     item = PrintedItem.query.filter(
         or_(PrintedItem.itemcode == scanned,
             PrintedItem.gagelabtag == scanned),
@@ -472,7 +476,19 @@ def kiosk_take():
         return error_response(ErrorCodes.VALIDATION_ERROR, str(badge_error),
                               http_code=422)
 
-    _ledger_write(item, 'take', -quantity, sso, name)
+    # Print-file revision the scanned part carried: explicit field, else the
+    # 'TAG|rev' tail of the scanned code. Recorded for traceability.
+    revision = data.get('revision')
+    if revision is None and '|' in (data.get('itemcode') or ''):
+        tail = data['itemcode'].split('|', 1)[1].strip()
+        revision = tail if tail.isdigit() else None
+    if revision is not None:
+        try:
+            revision = int(revision)
+        except (ValueError, TypeError):
+            revision = None
+
+    _ledger_write(item, 'take', -quantity, sso, name, revision=revision)
     return success_response(item.to_dict(),
                             message=f'Took {quantity}, {item.quantityonhand} left')