tmux source-file tmux/tmux.conf
tmux show -gqv extended-keys          # on
tmux show -gqv extended-keys-format   # csi-u
tmux -f tmux/tmux.conf new-session -d -s pi-tmux-check true
tmux kill-session -t pi-tmux-check
bash -n tmux/session.sh
java bootstripper.java check

niri msg action focus-window --id 71
# target client from `tmux list-clients`; currently /dev/pts/3
tmux display-panes -t /dev/pts/3 -d 10000
niri msg action screenshot-window --path /tmp/pi-tmux-final-window.png --show-pointer false

# tmux manual validation

## Quick smoke

```sh
tmux source-file tmux/tmux.conf
tmux show -gqv extended-keys          # on
tmux show -gqv extended-keys-format   # csi-u
tmux -f tmux/tmux.conf new-session -d -s pi-tmux-check true
tmux kill-session -t pi-tmux-check
bash -n tmux/session.sh
java bootstripper.java check
```

## Native feel checks

Inside tmux:

1. `Ctrl-Space r` reloads and shows `tmux reloaded`.
2. `Ctrl-Space ?` opens help popup.
3. `Ctrl-Space e` opens `tmux.conf` in Neovim popup.
4. `Ctrl-Space d` opens fzf project/session switcher.
5. `Ctrl-Space v`, `Ctrl-Space s` split panes in current dir.
6. `Ctrl-Space h/j/k/l` moves pane focus; repeated `h/j/k/l` keeps moving briefly.
7. `Ctrl-Space H/J/K/L` resizes panes.
8. `Ctrl-Space q` shows pane numbers; typing a number jumps pane.
9. `Ctrl-Space x` kills pane. `q` must not kill panes.
10. `Ctrl-Space [` enters vi copy mode; `v` selects; `y` copies to system clipboard.
11. In Pi lists, mouse wheel moves selection up/down.
12. In Neovim, `Alt-h/l` still swaps parameters; tmux must not steal it.

## Visual checks

Expected:

- Active pane border: bold magenta.
- Active border label: `█ ACTIVE # █`.
- Inactive pane defaults: dim grey on near-black.
- Status right: `me@desktop HH:MM`.
- Prefix warning appears while prefix is armed.
- Pane/resize key-table name appears while those modes are active.

Known tmux limit:

- tmux can dim only terminal default fg/bg. TUIs that paint explicit ANSI colors may not visually dim.

## Screenshot notes

Niri screenshot command:

```sh
niri msg action focus-window --id 71
# target client from `tmux list-clients`; currently /dev/pts/3
tmux display-panes -t /dev/pts/3 -d 10000
niri msg action screenshot-window --path /tmp/pi-tmux-final-window.png --show-pointer false
```

Current harness limitation:

- `niri screenshot-screen` captures focused screen, not necessarily the tmux client targeted by `tmux -t agent_fight`.
- Use manual focused-terminal screenshot when verifying the exact active badge.