Add Ansible SSH timeout troubleshooting article

Documents the SSH keepalive fix for dnf upgrade timeouts on Fedora hosts,
plus the do-agent task guard fix. Also adds Ansible & Fleet Management
section to the troubleshooting index.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

05-troubleshooting/index.md

@@ -13,6 +13,10 @@ Practical fixes for common Linux, networking, and application problems.
 - [ISP SNI Filtering & Caddy](isp-sni-filtering-caddy.md)
 - [yt-dlp YouTube JS Challenge Fix](yt-dlp-fedora-js-challenge.md)
 
+## ⚙️ Ansible & Fleet Management
+- [SSH Timeout During dnf upgrade on Fedora Hosts](ansible-ssh-timeout-dnf-upgrade.md)
+- [Vault Password File Missing](ansible-vault-password-file-missing.md)
+
 ## 📦 Docker & Systems
 - [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](docker-caddy-selinux-post-reboot-recovery.md)
 - [Gitea Actions Runner: Boot Race Condition Fix](gitea-runner-boot-race-network-target.md)