wiki: add WSL2 backup, Fedora43 training env, Ansible upgrades, firewalld mail ports articles; update indexes

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

MajorWiki-Deploy-Status.md

@@ -102,3 +102,18 @@ Every time a new article is added, the following **MUST** be updated to maintain
 - [[MajorRig|MajorRig]] — alternative git push host (WSL2 path documented)
 - [[03-11-2026|Status Update 2026-03-11]] — deployment date journal entry
 - [[03-13-2026|Status Update 2026-03-13]] — content expansion and SUMMARY.md sync
+
+---
+
+## Session Update — 2026-03-16
+
+**Article count:** 45 (was 42)
+
+**New articles added:**
+- `01-linux/distro-specific/wsl2-rebuild-fedora43-training-env.md` — full MajorTwin training env rebuild guide
+- `01-linux/distro-specific/wsl2-backup-powershell.md` — WSL2 backup via PowerShell scheduled task
+- `02-selfhosting/security/ansible-unattended-upgrades-fleet.md` — standardizing unattended-upgrades across Ubuntu fleet
+
+**SUMMARY.md:** Updated to include all 3 new articles. Run SUMMARY.md dedup script if duplicate content appears (see board file cleanup pattern).
+
+**Updated:** `updated: 2026-03-16`