docs: document tmux.conf bindings and new nav/archive keys in README

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -31,6 +31,62 @@ hqt
 | `Enter` | Attach to session (auto-resumes if not running) |
 | `r` | Rename session |
 | `s` | Stop session |
+| `h` / `l` | Focus the Projects / Sessions column |
+| `x` | Archive selected session (instant; keeps the row, kills the window) |
+| `A` | Toggle the Sessions column between active and archived |
+| `u` | Restore (unarchive) the selected session — archived view only |
+
+## tmux configuration
+
+hqt runs inside tmux and tags each harness window with an `@hqt_label` user
+option automatically — **it never edits your `~/.tmux.conf`**. The TUI itself
+needs no tmux config to run. The bindings below are opt-in: add the ones you
+want to your own `~/.tmux.conf` (`-n` = no prefix key).
+
+### Tool palette — `Alt+p` (required for the palette feature)
+
+Pops an fzf palette for the current session's project (nvim / lazygit / shell /
+clone / reset-windows) from inside a harness window. Requires `hqt` on your
+`PATH` (see Quick Start) and `fzf`. `run-shell` expands `#{window_name}` to a
+concrete window name before `hqt` builds its `display-popup`:
+
+```tmux
+bind -n M-p run-shell -b "hqt palette '#{window_name}'"
+```
+
+If you run hqt from a checkout instead of installing it, point `uv run` at the
+repo so the virtualenv self-heals when deps change:
+
+```tmux
+bind -n M-p run-shell -b "uv run --project /path/to/hq-term hqt palette '#{window_name}'"
+```
+
+### Session switcher — `Alt+o` (optional)
+
+Pops an fzf switcher over whatever you're doing (works inside a harness too).
+Rows are built from the `@hqt_label` hqt sets; `cut` takes the leading window
+index and `select-window` jumps to it:
+
+```tmux
+bind -n M-o display-popup -E -w 50% -h 40% -T ' switch session ' \
+  "tmux list-windows -F '#{window_index} #{?@hqt_label,#{@hqt_label},#{window_name}}' \
+   | fzf --reverse --no-info --prompt='session  ' \
+   | cut -d' ' -f1 \
+   | xargs -r tmux select-window -t"
+```
+
+### Scrollback passthrough — `PageUp` (optional)
+
+The TUI uses tmux's alternate screen. This sends `PageUp` straight through to
+full-screen apps (the TUI) while still entering copy-mode scrollback in normal
+panes:
+
+```tmux
+bind -n PageUp if-shell -F '#{alternate_on}' 'send-keys PageUp' 'copy-mode -eu'
+```
+
+After editing `~/.tmux.conf`, reload it with `tmux source-file ~/.tmux.conf`
+(or restart the server).
 
 ## Worktree-isolated sessions