printedparts stage 7: the kiosk - scan bin, scan badge, keypad, take

Two open endpoints: an item lookup by scanned code and the take POST -
the product's first unauthenticated write, held to the decision
record's bar (decrement-only, badge-attributed server-side, bounded,
physically rate-limited; justification in the plugin README). The
/parts-kiosk route is a full-screen no-auth view beside /shopfloor: a
hidden always-focused input consumes keyboard-wedge scans for
whichever step is active, TouchKeypad (net-new 3x4 grid) takes the
quantity, and a success screen resets after a few seconds. Manual
type-in fallbacks cover damaged labels. Kiosk test proves open access,
the over-take guard, the badge policy, and cache==ledger afterward.

tests/test_plugins/test_printedparts_ledger.py

@@ -128,3 +128,41 @@ def test_member_without_permission_gets_403(client, member_headers, item):
     assert client.post(f'/api/printedparts/items/{item}/restock',
                        json={'quantity': 1, 'badge': '1'},
                        headers=member_headers).status_code == 403
+
+
+def test_kiosk_take_is_open_decrement_only(client, auth_headers, app, item,
+                                           directory_employee):
+    """The kiosk endpoint needs no auth but only ever decrements stock."""
+    itemcode = '3DP-9001'
+    stocked = client.post(f'/api/printedparts/items/{item}/restock',
+                          json={'quantity': 5, 'badge': directory_employee},
+                          headers=auth_headers)
+    assert stocked.status_code == 200
+
+    lookup = client.get(f'/api/printedparts/kiosk/item/{itemcode}')
+    assert lookup.status_code == 200
+
+    take = client.post('/api/printedparts/kiosk/take', json={
+        'itemcode': itemcode, 'badge': directory_employee, 'quantity': 2})
+    assert take.status_code == 200, take.get_json()
+    assert take.get_json()['data']['quantityonhand'] == 3
+
+    too_many = client.post('/api/printedparts/kiosk/take', json={
+        'itemcode': itemcode, 'badge': directory_employee, 'quantity': 99})
+    assert too_many.status_code == 400
+
+    unknown = client.post('/api/printedparts/kiosk/take', json={
+        'itemcode': itemcode, 'badge': '111111111', 'quantity': 1})
+    assert unknown.status_code == 422
+
+    with app.app_context():
+        rows = PrintedItemTransaction.query.filter_by(
+            printeditemid=item, transactiontype='take').all()
+        assert len(rows) == 1
+        assert rows[0].quantitychange == -2
+        assert rows[0].employeename == 'Pat Printer'
+        cached = db.session.get(PrintedItem, item).quantityonhand
+        ledgersum = sum(r.quantitychange for r in
+                        PrintedItemTransaction.query.filter_by(
+                            printeditemid=item).all())
+        assert cached == ledgersum