docs(security): add gitea inventory export request gate [skip ci]

docs/security/source-control-primary-readiness-gate.snapshot.json

@@ -13,6 +13,7 @@
     "docs/security/source-control-workflow-secret-name-inventory.snapshot.json",
     "docs/security/source-control-primary-rollback-adr.snapshot.json",
     "docs/security/gitea-repo-inventory.snapshot.json",
+    "docs/security/gitea-authenticated-inventory-export-request.snapshot.json",
     "docs/security/gitea-org-repo-inventory-blocked.snapshot.json",
     "docs/security/security-followup-runtime-gate.snapshot.json"
   ],
@@ -40,11 +41,14 @@
       ],
       "current_gap": [
         "目前只有 public-only / blocked endpoint evidence",
+        "S4.5 已建立 authenticated/admin export request，但尚未取得 `gitea_repo_inventory_v1.status=ok` evidence",
+        "public-only API 只看到 2 個 repos，本機 remote inventory 看到 4 個 unique Gitea repos，gap 仍待 owner 解釋",
         "GITEA_READONLY_TOKEN 未提供",
         "不得使用 write-capable credential 當 read-only token"
       ],
       "allowed_now": [
         "顯示 blocked reason",
+        "mirror S4.5 authenticated inventory export request",
         "等待 read-only token 或 redacted admin export",
         "更新 approval board 與 decision table"
       ],