M6.5: cryptpad canonical Drone run #46 success (3 recipes now green via pipeline)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

BACKLOG.md

@@ -83,7 +83,7 @@ Two single-writer sections (§6.1): Builder edits only `## Build backlog`; Adver
       (`test_backup_mutate_restore`). No harness surgery — added generic per-recipe EXTRA_ENV
       (handles cryptpad's SANDBOX_DOMAIN). Fixed a real backup bug en route: set_env glued
       RESTIC_REPOSITORY onto a comment → backupbot had no restic repo (now newline-safe). Drone
-      canonical run = build #46 (in flight).
+      canonical run = **build #46 success** (~6m, all 3 stages green, clean teardown).
 - [ ] Enroll recipes 4–6 covering remaining D10 categories (multi-service+S3, large-volume,
       TLS-passthrough), no harness surgery
 - [ ] Re-verify keycloak backup post set_env fix (build #39 ran off an earlier backupbot deploy)