docs(packshots): record l04/l07/l10 identity provenance

Three enrollment views were refused by the name/OCR check at 0.70, and the
research says all three refusals are false negatives:

- sku_l04: the packshot is byte-identical (MD5 510db1965bc483899c0cce17c72ba10e)
  to Amazon media 61yWDtDjDuL for ASIN B0197VWHRG, やまや めんたいマヨネーズタイプ
  200g, JAN 4903085062863. 明太子屋さんがつくった is a package slogan, not a
  competing brand. Caveat recorded: 200g is superseded by the current 300g.
- sku_l07: 丸和油脂 ラッキーマヨネーズ 200g, JAN 4978931401615, corroborated by
  Amazon, Rakuten, Yahoo Shopping and Kakaku. The front prints the product name
  but never the maker or size, so full-name overlap cannot reach 0.70.
- sku_l10: exact 400g front, JAN 4901001114030, with the 450g rejection.

Also adds the missing sku_l10 OCR read, generated with the current engine, and
l10's attribution entry. Manifests are tracked; the retailer images they cite
are restricted-research and stay untracked, matching the existing precedent.

recognization/data/packshots/source/ATTRIBUTION.json

@@ -10,5 +10,12 @@
     "product": "丸和油脂 ラッキーマヨネーズ 200g",
     "source_page": "https://www.amazon.co.jp/dp/B0BHQW3VVP",
     "notes": "Exact 200g product; major-retailer pack shot. JAN/part number 4978931401615, corroborated by Yahoo Shopping listing."
+  },
+  "sku_l10": {
+    "url": "https://thumbnail.image.rakuten.co.jp/@0_mall/matsukiyo/cabinet/d0042/4901001114030_1.jpg?_ex=1000x1000",
+    "product": "味の素 ピュアセレクト マヨネーズ 400g",
+    "source_page": "https://item.rakuten.co.jp/matsukiyo/4901001114030/",
+    "jan": "4901001114030",
+    "notes": "Exact 400g front packshot. The catalog's 450g was wrong: Ajinomoto's lineup is 250/400/600/1000g and the shelf tag in add/image6.jpg reads 400g. See data/packshots/research/sku_l10/manifest.json."
   }
 }