docs: add tmux skill guidance

skills/tmux/scripts/find-sessions.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat <<'USAGE'
+Usage: find-sessions.sh [-L socket-name|-S socket-path|-A] [-q pattern]
+
+List tmux sessions on a socket (default tmux socket if none provided).
+
+Options:
+  -L, --socket       tmux socket name (passed to tmux -L)
+  -S, --socket-path  tmux socket path (passed to tmux -S)
+  -A, --all          scan all sockets under CLAWDIS_TMUX_SOCKET_DIR
+  -q, --query        case-insensitive substring to filter session names
+  -h, --help         show this help
+USAGE
+}
+
+socket_name=""
+socket_path=""
+query=""
+scan_all=false
+socket_dir="${CLAWDIS_TMUX_SOCKET_DIR:-${TMPDIR:-/tmp}/clawdis-tmux-sockets}"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -L|--socket)      socket_name="${2-}"; shift 2 ;;
+    -S|--socket-path) socket_path="${2-}"; shift 2 ;;
+    -A|--all)         scan_all=true; shift ;;
+    -q|--query)       query="${2-}"; shift 2 ;;
+    -h|--help)        usage; exit 0 ;;
+    *) echo "Unknown option: $1" >&2; usage; exit 1 ;;
+  esac
+done
+
+if [[ "$scan_all" == true && ( -n "$socket_name" || -n "$socket_path" ) ]]; then
+  echo "Cannot combine --all with -L or -S" >&2
+  exit 1
+fi
+
+if [[ -n "$socket_name" && -n "$socket_path" ]]; then
+  echo "Use either -L or -S, not both" >&2
+  exit 1
+fi
+
+if ! command -v tmux >/dev/null 2>&1; then
+  echo "tmux not found in PATH" >&2
+  exit 1
+fi
+
+list_sessions() {
+  local label="$1"; shift
+  local tmux_cmd=(tmux "$@")
+
+  if ! sessions="$("${tmux_cmd[@]}" list-sessions -F '#{session_name}\t#{session_attached}\t#{session_created_string}' 2>/dev/null)"; then
+    echo "No tmux server found on $label" >&2
+    return 1
+  fi
+
+  if [[ -n "$query" ]]; then
+    sessions="$(printf '%s\n' "$sessions" | grep -i -- "$query" || true)"
+  fi
+
+  if [[ -z "$sessions" ]]; then
+    echo "No sessions found on $label"
+    return 0
+  fi
+
+  echo "Sessions on $label:"
+  printf '%s\n' "$sessions" | while IFS=$'\t' read -r name attached created; do
+    attached_label=$([[ "$attached" == "1" ]] && echo "attached" || echo "detached")
+    printf '  - %s (%s, started %s)\n' "$name" "$attached_label" "$created"
+  done
+}
+
+if [[ "$scan_all" == true ]]; then
+  if [[ ! -d "$socket_dir" ]]; then
+    echo "Socket directory not found: $socket_dir" >&2
+    exit 1
+  fi
+
+  shopt -s nullglob
+  sockets=("$socket_dir"/*)
+  shopt -u nullglob
+
+  if [[ "${#sockets[@]}" -eq 0 ]]; then
+    echo "No sockets found under $socket_dir" >&2
+    exit 1
+  fi
+
+  exit_code=0
+  for sock in "${sockets[@]}"; do
+    if [[ ! -S "$sock" ]]; then
+      continue
+    fi
+    list_sessions "socket path '$sock'" -S "$sock" || exit_code=$?
+  done
+  exit "$exit_code"
+fi
+
+tmux_cmd=(tmux)
+socket_label="default socket"
+
+if [[ -n "$socket_name" ]]; then
+  tmux_cmd+=(-L "$socket_name")
+  socket_label="socket name '$socket_name'"
+elif [[ -n "$socket_path" ]]; then
+  tmux_cmd+=(-S "$socket_path")
+  socket_label="socket path '$socket_path'"
+fi
+
+list_sessions "$socket_label" "${tmux_cmd[@]:1}"