feat: implement --onboard flag in multi-agent-mux-create and update AGENT.md onboarding handshake protocol

.agents/skills/multi-agent-mux-create/scripts/create_session.sh

@@ -34,6 +34,7 @@ Options:
   --dry-run           print commands without executing
   --tmux-server NAME  specify isolated tmux server name
   --submit-job PROMPT submit a job to multi-agent-mux-delegate-job registry with the given prompt
+  --onboard           automatically submit a project alignment/orientation job to the new agent
   -h, --help          this help
 EOF
 }
@@ -46,6 +47,7 @@ USE_WRAPPER=0
 DRY_RUN=0
 TMUX_SERVER_OPT=""
 SUBMIT_JOB_PROMPT=""
+ONBOARD=0
 
 while [ $# -gt 0 ]; do
   case "$1" in
@@ -57,6 +59,7 @@ while [ $# -gt 0 ]; do
     --dry-run)   DRY_RUN=1; shift ;;
     --tmux-server) TMUX_SERVER_OPT="$2"; shift 2 ;;
     --submit-job) SUBMIT_JOB_PROMPT="$2"; shift 2 ;;
+    --onboard)   ONBOARD=1; shift ;;
     -h|--help)   usage; exit 0 ;;
     *) echo "ERROR: unknown arg: $1" >&2; usage; exit 2 ;;
   esac
@@ -143,7 +146,7 @@ fi
 spawn
 
 # TUI 준비 대기
-sleep 6
+wait_for_tui_ready "$SESSION_NAME" "$AGENT"
 
 # pane 메타 캡처
 PANE_PID=$(_tmux list-panes -t "$SESSION_NAME" -F '#{pane_pid}' 2>/dev/null || echo "")
@@ -179,6 +182,15 @@ case "$AGENT" in
     ;;
 esac
 
+# If --onboard is specified, automatically build the onboarding prompt
+if [ "$ONBOARD" = "1" ] && [ -z "$SUBMIT_JOB_PROMPT" ]; then
+  SUBMIT_JOB_PROMPT="You are a newly spawned $ROLE Team Leader agent in this workspace. To align yourself with the project context, perform the following tasks:
+1. Read the project documentation at README.md and the multi-agent protocol guidelines at .agents/AGENT.md to understand the design rules.
+2. Run 'git status' and 'git diff' to analyze the current modifications and active work in the repository.
+3. Read .mam/agent-sessions.yaml to see other running agent sessions, their roles, and confirm your own assigned role: $ROLE.
+4. Once you have fully comprehended the project state, publish a completed event (using publish_event.py) with the detail 'Onboarding complete; aligned with role $ROLE'."
+fi
+
 # agent-sessions.yaml 에 append
 DELEGATE_JOB_ID=""
 if [ -n "$SUBMIT_JOB_PROMPT" ]; then
@@ -301,7 +313,22 @@ echo "=== created ==="
 echo "tmux session: $SESSION_NAME (pane pid $PANE_PID, cmd $PANE_CMD, cwd $PANE_CWD)"
 if [ -n "$DELEGATE_JOB_ID" ]; then
   echo "delegate job: $DELEGATE_JOB_ID"
-  delegate_publish_event "$DELEGATE_JOB_ID" started "multi-agent-mux session created"
+  
+  # Construct instructions matching multi-agent-mux-delegate-job format
+  pub="python3 .agents/skills/multi-agent-mux-delegate-job/scripts/publish_event.py --job $DELEGATE_JOB_ID"
+  instructions="Your job_id is \"$DELEGATE_JOB_ID\" (the one just registered for THIS delegation).
+
+On start run:        $pub --event started.
+On progress (optional): $pub --event progress --detail '<short status>'.
+On success run:      $pub --event completed --detail '<one-line summary>'.
+On failure run:      $pub --event error     --detail '<one-line reason>'.
+
+Task: $SUBMIT_JOB_PROMPT"
+
+  # Inject instructions into the tmux pane
+  inject_instructions "$SESSION_NAME" "$instructions" "$DELEGATE_JOB_ID"
+  
+  delegate_publish_event "$DELEGATE_JOB_ID" started "multi-agent-mux session created and instructions injected"
   WD_PID=$(start_watchdog "$DELEGATE_JOB_ID" "$WORKSPACE")
   echo "watchdog PID: $WD_PID"
 fi