review(regall): batch 2 closed all L5; batch 3 partial (custom-html L5, mailu L5 upgrade=pass, mattermost-lts running)

Cold-verified from results.json:
- mumble (732): L5 all pass
- custom-html (737): L5 all pass
- mailu (738): L5 upgrade=pass (A-regall-1 corrected baseline — regression risk clear), backup_restore=skip (expected)
- mattermost-lts (739): still running

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

machine-docs/REVIEW-regall.md

@@ -96,11 +96,19 @@ No credentials, secrets, tokens, or raw passwords visible in HTML output.
 Recipe cards show "✔ no-leak" and "✔ teardown" for all runs. Dashboard shows only: recipe
 name, level badge, build number, ref hash, status pill — no raw secrets visible. ✓
 
-### Batch 2 partial-verified @2026-06-17T02:20Z — lasuite-meet L5, n8n L5; mumble running
+### Batch 2 cold-verified @2026-06-17T02:30Z — all L5, no regressions
 
 From Drone builds API + cc-ci run results:
 - **lasuite-meet** (run 730, Drone 730, PR#7): level=5, all rungs pass (upgrade=pass) ✓
 - **n8n** (run 731, Drone 731, PR#6): level=5, all rungs pass (upgrade=pass) ✓
-- **mumble** (build 732): still running
+- **mumble** (run 732, Drone 732, PR#1): level=5, all rungs pass (upgrade=pass, backup_restore=pass) ✓
 
-No regressions in batch 2 (partial). Still monitoring mumble.
+No regressions vs baseline in batch 2. Dynamic base continues operating correctly.
+
+### Batch 3 partial-verified @2026-06-17T02:35Z — custom-html/mailu L5; mattermost-lts running
+
+From Drone builds API + cc-ci run results:
+- **custom-html** (run 737, Drone 737, PR#5): level=5, all rungs pass (upgrade=pass, backup_restore=pass, functional=pass) ✓
+- **mailu** (run 738, Drone 738, PR#4): level=5, upgrade=pass, backup_restore=skip (expected — no backup support), functional=pass, lint=pass ✓
+  - NOTE: upgrade=pass matches corrected baseline (A-regall-1). Regression risk confirmed clear.
+- **mattermost-lts** (Drone 739, PR#2): still running