Add orchestrate skill: main-actor pattern + mav-agent/mav-tmux wrappers

One bot owns the chat and delegates coding to persistent tmux sub-agents,
using a .done file marker for a reliable handoff (status/wait/result).
Includes README + install.sh for one-command setup.

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

bin/mav-tmux

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# mav-tmux — run a command in the persistent mav tmux session and capture output
+# usage: mav-tmux run "command"
+#        mav-tmux read          (capture current pane output)
+#        mav-tmux clear         (clear the pane)
+SESSION="mav"
+
+# ensure session exists
+TMUX= tmux has-session -t "$SESSION" 2>/dev/null || TMUX= tmux new-session -d -s "$SESSION"
+
+case "${1:-read}" in
+  run)
+    CMD="${2:?usage: mav-tmux run <command>}"
+    MARKER="__DONE_$(date +%s%N)__"
+    TMUX= tmux send-keys -t "$SESSION" "$CMD; echo $MARKER" Enter
+    # wait for marker
+    for i in $(seq 1 60); do
+      sleep 0.5
+      OUT=$(TMUX= tmux capture-pane -t "$SESSION" -p 2>/dev/null)
+      if echo "$OUT" | grep -q "$MARKER"; then
+        echo "$OUT" | sed "/$MARKER/d" | sed '/^$/d' | tail -30
+        break
+      fi
+    done
+    ;;
+  read)
+    TMUX= tmux capture-pane -t "$SESSION" -p 2>/dev/null
+    ;;
+  clear)
+    TMUX= tmux send-keys -t "$SESSION" "clear" Enter
+    ;;
+  *)
+    echo "usage: mav-tmux run <cmd> | read | clear"
+    ;;
+esac