meta(handoff): MinIO-split B4 fully closed — gallery preview fixed (MoreThenCms 09cb072d)

B4 endpoint flip + pre-existing S3-provider KeyNotFoundException bug (gallery preview
ownerId) fixed via drop-in DLL. Preview confirmed live by user. Runbook §B4 + NEXT_SESSION
updated with root cause + fix reference.

Co-Authored-By: Claude <noreply@anthropic.com>

.tasks/NEXT_SESSION.md

@@ -47,7 +47,7 @@ Rollback-теги v2 (0.42.1) живы в registry для каждого.
 |---|---|---|
 | **B3 v3 тираж** | ✅ **ЗАВЕРШЁН 6/6 GREEN** | все 6 runbook'ов §0.43.2 |
 | MinIO split Track A (books-vds minio 2020→2025) | ⏳ TODO — transparent, отдельно | runbook §Track A |
-| MinIO split B4 .NET catch-all админ s3 endpoint | ✅ DONE 2026-07-30 — `Web.config` 6/6 endpoint flipped, creds verified (MINIO_ROOT_USER==accessKey, reuse), IIS recycled, login 200. Asset Manager preview — user-confirm pending | runbook §B4 |
+| MinIO split B4 .NET catch-all админ s3 endpoint | ✅ DONE 2026-07-30 — `Web.config` 6/6 endpoint flipped, creds verified, IIS recycled, login 200. Превью confirmed user'ом: оказался pre-existing баг S3-провайдера (KeyNotFoundException на ownerId в GalleriesStorage ctor) — фикс 09cb072d в MoreThenCms (drop-in DLL), 21/21 tests, live-verified | runbook §B4 |
 | MinIO split B5 Obsidian Remotely Save endpoint | ✅ DONE 2026-07-30 — endpoint flipped в vault (verified) | runbook §B5; memory `obsidian-remotely-save-endpoint-after-mirror` |
 | books-task-runner-registry-auth-cred | 🔵 blocked — cred в config-volume, рабочий образ содержит СТАРЫЙ registryGc; тега master-a3734d5 в реестре нет | `.tasks/STATUS.md` §books-task-runner |