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>

03-opensource/dev-tools/tmux.md

@@ -0,0 +1,93 @@
+# tmux — Persistent Terminal Sessions
+
+## Problem
+
+SSH sessions die when your connection drops, your laptop closes, or you walk away. Long-running jobs — storage migrations, file scans, downloads — get killed mid-run. You need a way to detach from a session, come back later, and pick up exactly where you left off.
+
+## Solution
+
+`tmux` is a terminal multiplexer. It runs sessions that persist independently of your SSH connection. You can detach, disconnect, reconnect from a different machine, and reattach to find everything still running.
+
+### Installation (Fedora)
+
+```bash
+sudo dnf install tmux
+```
+
+### Core Workflow
+
+```bash
+# Start a named session
+tmux new-session -s mysession
+
+# Detach from a session (keeps it running)
+Ctrl+b, d
+
+# List running sessions
+tmux ls
+
+# Reattach to a session
+tmux attach -t mysession
+
+# Kill a session when done
+tmux kill-session -t mysession
+```
+
+### Start a Background Job Directly
+
+Skip the interactive session entirely — start a job in a new detached session in one command:
+
+```bash
+tmux new-session -d -s rmlint2 "rmlint /majorstorage// /mnt/usb// /majorRAID 2>&1 | tee /majorRAID/rmlint_scan2.log"
+```
+
+The job runs immediately in the background. Attach later to check progress:
+
+```bash
+tmux attach -t rmlint2
+```
+
+### Capture Output Without Attaching
+
+Read the current state of a session without interrupting it:
+
+```bash
+tmux capture-pane -t rmlint2 -p
+```
+
+### Split Panes
+
+Monitor multiple things in one terminal window:
+
+```bash
+# Horizontal split (top/bottom)
+Ctrl+b, "
+
+# Vertical split (left/right)
+Ctrl+b, %
+
+# Switch between panes
+Ctrl+b, arrow keys
+```
+
+### Real-World Use
+
+On **majorhome**, all long-running storage operations run inside named tmux sessions so they survive SSH disconnects:
+
+```bash
+tmux new-session -d -s rmlint2 "rmlint ..."   # dedup scan
+tmux new-session -d -s rsync-migrate "rsync ..."  # file migration
+tmux ls  # check what's running
+```
+
+---
+
+## tmux vs screen
+
+Both work. tmux has better split-pane support and scripting. screen is simpler and more universally installed. I use both — tmux for new jobs, screen for legacy ones. See the [screen](screen.md) article for reference.
+
+---
+
+## Tags
+
+#tmux #terminal #linux #ssh #productivity #dev-tools