Durable binary channel for [imgproxy-watermark-glyph-books-vds] — base64-in-task got corrupted in transit (field truncation looped PNG tail, dropped IEND). This is the verified-intact 348x42 RGBA wordmark. Admin: git show this path, sha256==e995...971fc, then set IMGPROXY_WATERMARK_DATA=base64(this file) on imgproxy stack 29. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>