wiki: add dev-tools section with tmux, screen, and rsync articles

Add three new articles to 03-opensource/dev-tools/:
- tmux: persistent terminal sessions, background jobs, capture-pane
- screen: lightweight alternative, comparison table
- rsync: flags reference, resumable transfers, SSH usage

Update all indexes (SUMMARY, section index, main index, README).
Article count: 28 → 31. Remove tmux from writing backlog.

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

index.md

@@ -3,7 +3,7 @@
 > A growing reference of Linux, self-hosting, open source, streaming, and troubleshooting guides. Written by MajorLinux. Used by MajorTwin.
 >
 > **Last updated:** 2026-03-13
-> **Article count:** 28
+> **Article count:** 31
 
 ## Domains
 
@@ -11,7 +11,7 @@
 |---|---|---|
 | 🐧 Linux & Sysadmin | `01-linux/` | 9 |
 | 🏠 Self-Hosting & Homelab | `02-selfhosting/` | 8 |
-| 🔓 Open Source Tools | `03-opensource/` | 1 |
+| 🔓 Open Source Tools | `03-opensource/` | 4 |
 | 🎙️ Streaming & Podcasting | `04-streaming/` | 1 |
 | 🔧 General Troubleshooting | `05-troubleshooting/` | 9 |
 
@@ -73,6 +73,11 @@
 ### Productivity
 - [rmlint: Duplicate File Scanning](03-opensource/productivity/rmlint-duplicate-scanning.md) — extremely fast duplicate file finding and storage reclamation
 
+### Development Tools
+- [tmux: Persistent Terminal Sessions](03-opensource/dev-tools/tmux.md) — detachable sessions for long-running jobs over SSH
+- [screen: Simple Persistent Sessions](03-opensource/dev-tools/screen.md) — lightweight terminal multiplexer, universally available
+- [rsync: Fast, Resumable File Transfers](03-opensource/dev-tools/rsync.md) — incremental file sync locally and over SSH, survives interruptions
+
 ---
 
 ## 🎙️ Streaming & Podcasting
@@ -99,15 +104,15 @@
 
 | Date | Article | Domain |
 |---|---|---|
+| 2026-03-13 | [tmux: Persistent Terminal Sessions](03-opensource/dev-tools/tmux.md) | Open Source |
+| 2026-03-13 | [screen: Simple Persistent Sessions](03-opensource/dev-tools/screen.md) | Open Source |
+| 2026-03-13 | [rsync: Fast, Resumable File Transfers](03-opensource/dev-tools/rsync.md) | Open Source |
 | 2026-03-13 | [Gemini CLI Manual Update](05-troubleshooting/gemini-cli-manual-update.md) | Troubleshooting |
 | 2026-03-13 | [rmlint: Duplicate File Scanning](03-opensource/productivity/rmlint-duplicate-scanning.md) | Open Source |
 | 2026-03-13 | [SnapRAID & MergerFS Storage Setup](01-linux/storage/snapraid-mergerfs-setup.md) | Linux |
 | 2026-03-13 | [Qwen2.5-14B OOM on RTX 3080 Ti (12GB)](05-troubleshooting/gpu-display/qwen-14b-oom-3080ti.md) | Troubleshooting |
 | 2026-03-13 | [Apache Outage: Fail2ban Self-Ban + Missing iptables Rules](05-troubleshooting/networking/fail2ban-self-ban-apache-outage.md) | Troubleshooting |
 | 2026-03-12 | [Docker & Caddy Recovery After Reboot](05-troubleshooting/docker-caddy-selinux-post-reboot-recovery.md) | Troubleshooting |
-| 2026-03-11 | [MajorWiki Setup & Pipeline](05-troubleshooting/majwiki-setup-and-pipeline.md) | Troubleshooting |
-| 2026-03-11 | [Obsidian Cache Hang Recovery](05-troubleshooting/obsidian-cache-hang-recovery.md) | Troubleshooting |
-| 2026-03-11 | [yt-dlp JS Challenge Fix on Fedora](05-troubleshooting/yt-dlp-fedora-js-challenge.md) | Troubleshooting |
 
 ---
 
@@ -120,4 +125,3 @@
 | Troubleshooting NVIDIA on Linux | Troubleshooting | Medium | No |
 | Pi-hole setup and local DNS | Self-Hosting | Medium | No |
 | Nextcloud setup with Docker | Self-Hosting | Medium | No |
-| tmux basics | Linux | Low | No |