feat: add pa-mode launch script

Adds the main launch script for PA Agent Mode that manages a persistent
tmux session named "pa". Supports attach/create, new, kill, and status
commands. Records session starts in the history index.json file.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

automation/pa-mode

@@ -0,0 +1,89 @@
+#!/usr/bin/env bash
+# PA Agent Mode - Launch/attach to persistent PA tmux session
+set -euo pipefail
+
+SESSION_NAME="pa"
+HISTORY_DIR="$HOME/.claude/state/personal-assistant/history"
+INDEX_FILE="$HISTORY_DIR/index.json"
+
+usage() {
+    echo "Usage: pa-mode [command]"
+    echo ""
+    echo "Commands:"
+    echo "  (none)    Attach to existing session or create new one"
+    echo "  new       Force new session (detaches existing if any)"
+    echo "  kill      Terminate the PA session"
+    echo "  status    Show session status"
+    echo ""
+}
+
+get_session_id() {
+    date +"%Y-%m-%d_%H-%M-%S"
+}
+
+create_session() {
+    local session_id
+    session_id=$(get_session_id)
+    local history_file="$HISTORY_DIR/${session_id}.jsonl"
+
+    # Record session start in index
+    local tmp_file
+    tmp_file=$(mktemp)
+    jq --arg id "$session_id" --arg started "$(date -Iseconds)" \
+        '.sessions += [{"id": $id, "started": $started, "ended": null, "summarized": false, "topics": []}]' \
+        "$INDEX_FILE" > "$tmp_file" && mv "$tmp_file" "$INDEX_FILE"
+
+    # Create tmux session with claude in PA mode
+    # Using HISTFILE-like approach: set env var for history location
+    tmux new-session -d -s "$SESSION_NAME" -c "$HOME" \
+        "PA_SESSION_ID='$session_id' PA_HISTORY_FILE='$history_file' claude --dangerously-skip-permissions --agent personal-assistant"
+
+    echo "Created new PA session: $session_id"
+}
+
+attach_session() {
+    if tmux has-session -t "$SESSION_NAME" 2>/dev/null; then
+        tmux attach-session -t "$SESSION_NAME"
+    else
+        create_session
+        tmux attach-session -t "$SESSION_NAME"
+    fi
+}
+
+case "${1:-}" in
+    "")
+        attach_session
+        ;;
+    new)
+        if tmux has-session -t "$SESSION_NAME" 2>/dev/null; then
+            echo "Killing existing session..."
+            tmux kill-session -t "$SESSION_NAME"
+        fi
+        create_session
+        tmux attach-session -t "$SESSION_NAME"
+        ;;
+    kill)
+        if tmux has-session -t "$SESSION_NAME" 2>/dev/null; then
+            tmux kill-session -t "$SESSION_NAME"
+            echo "PA session terminated"
+        else
+            echo "No PA session running"
+        fi
+        ;;
+    status)
+        if tmux has-session -t "$SESSION_NAME" 2>/dev/null; then
+            echo "PA session is running"
+            tmux list-sessions -F "#{session_name}: #{session_created} (#{session_attached} attached)" | grep "^$SESSION_NAME:"
+        else
+            echo "PA session is not running"
+        fi
+        ;;
+    -h|--help|help)
+        usage
+        ;;
+    *)
+        echo "Unknown command: $1"
+        usage
+        exit 1
+        ;;
+esac