style: format tmux/setw for logseq-flavored markdown

Author: codekiln

pages/tmux___setw.md

@@ -0,0 +1,68 @@
+- Yes — **`setw` is only meaningful inside a tmux context.**
+- But there are *two different ways* it can be valid, depending on how you run it.
+- ## 1. `setw` is a tmux command, not a shell command
+  `setw` is short for:
+  - ~~~
+    set-window-option
+    ~~~
+  It is part of **tmux's command language**, not your shell's.
+  So this:
+  - ~~~
+    setw -g pane-border-style fg=colour238
+    ~~~
+  is **not valid in `bash`, `zsh`, etc.**
+  If you type it in a normal terminal that is *not inside tmux*, you'll get:
+  - ~~~
+    command not found
+    ~~~
+  because your shell has no idea what `setw` is.
+- ## 2. When it *is* valid
+  - ### ✅ Inside a tmux session, in command mode
+    If you're inside tmux:
+    - Press:
+      - ~~~
+        prefix + :
+        ~~~
+    - Type:
+      - ~~~
+        setw -g pane-border-style fg=colour238
+        ~~~
+    - Hit Enter
+    That runs the command in tmux's command interpreter.
+  - ### ✅ Outside tmux, if you prefix with `tmux`
+    You can also run it from a normal shell like this:
+    - ~~~
+      tmux setw -g pane-border-style fg=colour238
+      ~~~
+    In this form:
+    - `tmux` = client program
+    - `setw` = subcommand passed to the tmux server
+    tmux sends it to the running server and executes it.
+- ## 3. Where it is *not* valid
+  - ### ❌ Plain shell (unqualified)
+    This will never work:
+    - ~~~
+      setw -g pane-border-style ...
+      ~~~
+    unless:
+    - you're inside `prefix + :` command mode in tmux.
+- ## 4. Rule of thumb
+  - Inside tmux command mode: ✅ `setw ...`
+  - Normal shell: ✅ `tmux setw ...`
+  - Normal shell without `tmux`: ❌ `setw ...`
+  - Inside tmux pane as shell command: ❌ unless prefixed
+- ## 5. Mental model
+  Think of tmux like `git`:
+  - ~~~
+    git commit     # works
+    commit         # doesn't
+    ~~~
+  Same pattern:
+  - ~~~
+    tmux setw ...
+    setw ...
+    ~~~
+- ## 6. Practical advice
+  If you're experimenting:
+  - Inside tmux live: → `prefix :` then type `setw ...`
+  - Writing config or scripts: → use `tmux setw ...`