fix: .party-notify uses PARTY_TMUX, not bare tmux from PATH

party

@@ -441,14 +441,23 @@ tmux_party_setup_server() {
     # keeps it out of typical `ls` listings. The per-party private dir
     # hosts at most one socket so a fixed name is safe.
     notify_script="${sock%/*}/.party-notify"
-    cat > "$notify_script" <<'EOF'
+    # Two heredocs: the first (expanding) pins the tmux binary the party
+    # was hosted with — a bare `tmux` from the server's PATH may be a
+    # different, older binary than $PARTY_TMUX, which is the whole reason
+    # PARTY_TMUX exists. The second (quoted) is the static body. A
+    # PARTY_TMUX containing a double quote or $ would break the pin;
+    # that's accepted — it's the host's own env var on their own party.
+    cat > "$notify_script" <<EOF
 #!/bin/sh
+tmux="$PARTY_TMUX"
+EOF
+    cat >> "$notify_script" <<'EOF'
 # Auto-generated by party. Fan a display-message out to every client
 # of the party server. Args: $1 = socket, $2 = client_user, $3 = "joined"|"left"
 sock="$1"; user="$2"; verb="$3"
-tmux -S "$sock" list-clients -F '#{client_name}' 2>/dev/null \
+"$tmux" -S "$sock" list-clients -F '#{client_name}' 2>/dev/null \
   | while read -r c; do
-        tmux -S "$sock" display-message -c "$c" "$user $verb the party" 2>/dev/null || :
+        "$tmux" -S "$sock" display-message -c "$c" "$user $verb the party" 2>/dev/null || :
     done
 EOF
     chmod 0755 "$notify_script"