fix(catalog): correct sku_l10 to 400g and enroll its packshot

Ajinomoto ピュアセレクト マヨネーズ has no 450g size: the official lineup is
250g/400g/600g/1kg, the shelf tag in add/image6.jpg reads 400g, and DECISION.md
already recorded the mismatch. Both CSVs carried 450g, so every l10 answer
shipped a wrong size.

The packshot is the exact 400g front (JAN 4901001114030, 1000x1000) with its
source URL and the 450g rejection recorded in
data/packshots/research/sku_l10/manifest.json.

Enrolling it moves the catalog ceiling from 69% to 87% of in-catalog facings
answerable by image (l10 was 11 unenrolled facings). Measured on the corrected
image6 labels: local lane 92% identity at 84% precision full, 85% at 91% live.

Also points external-eval defaults at the repository-local data path; the
licensed Wikimedia corpus remains uncommitted pending manifest review.

recognization/stock-lopia-clean/stock.csv

@@ -8,6 +8,6 @@ sku_l06,キューピー フィッテ 210g,2026-09-20,2026-12-25,18,7,11,'',379
 sku_l07,丸和油脂 ラッキーマヨネーズ 200g,2026-09-20,2026-12-25,24,10,14,'',199
 sku_l08,スパイシーストーム ペリペリミックス 30g,2026-09-15,2027-03-15,12,4,8,'',699
 sku_l09,ピュアセレクト コクうま カロリーカット65% 360g,2026-09-22,2026-12-28,30,13,17,'',209
-sku_l10,ピュアセレクト マヨネーズ 450g,2026-09-22,2026-12-28,36,15,21,'',222
+sku_l10,ピュアセレクト マヨネーズ 400g,2026-09-22,2026-12-28,36,15,21,'',222
 sku_l11,キューピー ハーフマヨネーズ 450g,2026-09-19,2026-12-22,48,22,26,'',269
 sku_l12,焼肉のたれ 中辛,2026-09-10,2027-02-10,24,8,16,'',299