feat(omo): reset hand-set Ghostty tab titles when a tab gets focus

A tab renamed in Ghostty ignores the title tmux sends, so it stops
showing its session name. omo-status focus now clears that override
through Ghostty's set_tab_title action, finding the tab by its terminal
title, so every tab shows its tmux session again.

.local/bin/omo-status

@@ -7,6 +7,8 @@
 # Each pane running omo keeps its own state in the pane option @omo_state, and
 # the tab shows the most urgent one. Focusing the tab clears red, amber and green,
 # and selects the pane whose banner you were sent (@omo_jump, set by omo-notify).
+# It also clears any title you gave the Ghostty tab by hand, so tabs always show
+# their tmux session's name.
 #
 # Usage: omo-status set <pane> <working|input|done|error|clear>
 #        omo-status focus <client>     (run by the tmux client-focus-in hook)
@@ -51,6 +53,22 @@ looking_at() {
     tmux list-clients -t "$session" -F '#{client_flags}' | grep -q focused
 }
 
+# A tab renamed in Ghostty ignores tmux's title until the override is cleared.
+# Finds the tab by its terminal title, which tmux keeps as "[marker ]<session>".
+reset_tab_title() {
+  osascript - "$1" <<'APPLESCRIPT' >/dev/null 2>&1
+on run argv
+  set sessionName to item 1 of argv
+  if application "Ghostty" is not running then return
+  tell application "Ghostty"
+    repeat with term in (every terminal whose name is sessionName or name ends with (" " & sessionName))
+      perform action "set_tab_title:" on term
+    end repeat
+  end tell
+end run
+APPLESCRIPT
+}
+
 case ${1:-} in
   set)
     pane=${2:?pane id required} state=${3:?state required}
@@ -80,6 +98,7 @@ case ${1:-} in
       esac
     done < <(tmux list-panes -s -t "$session" -F '#{pane_id} #{@omo_state}')
     show_most_urgent "$session"
+    reset_tab_title "$(tmux display-message -p -t "$session" '#{session_name}')"
     ;;
   *)
     sed -n '2,/^$/s/^# \{0,1\}//p' "$0" >&2

README.md

@@ -248,7 +248,7 @@ Custom scripts and binaries are stored in `.local/bin/`:
 - `cldir`: Change directory with Claude context
 - `owt`: Git worktree workspaces for coding agents (see [Agent workspaces](#agent-workspaces-owt))
 - `omo-notify`: Sound, tab marker and notification for OmO's hooks. Ghostty posts the notification, so clicking it opens the session's tab and pane
-- `omo-status`: Coloured marker in front of the Ghostty tab title for each tmux session running omo: 🔴 stopped with an error, 🟡 waiting for your answer, 🟢 finished, 🔵 working. A tab with several agents shows the most urgent one; focusing the tab clears red, amber and green
+- `omo-status`: Coloured marker in front of the Ghostty tab title for each tmux session running omo: 🔴 stopped with an error, 🟡 waiting for your answer, 🟢 finished, 🔵 working. A tab with several agents shows the most urgent one; focusing the tab clears red, amber and green, and undoes any title you gave the tab by hand so it always shows its session name
 - `docker-nuke`: Force-restart a wedged Docker Desktop, capturing diagnostics to `~/.local/state/docker-nuke/` first (`--dry-run` to preview, `--no-restart` to leave it down, `--deep` for root helpers)
 
 The `links` step of `setup-mac.sh` links each script into `~/.local/bin`, which `.zshrc` puts on your PATH. `pbcopy` and `pbpaste` are OSC 52 clipboard shims for headless servers, so they are not linked on macOS.