feat: add pa-summarize hook script

automation/pa-summarize

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# PA Summarize - Extract session summary before shutdown
+set -euo pipefail
+
+# This script is called by tmux hook or manually
+# It sends a summarization request to the running claude session
+
+SESSION_NAME="pa"
+
+if ! tmux has-session -t "$SESSION_NAME" 2>/dev/null; then
+    echo "No PA session running"
+    exit 1
+fi
+
+# Send summarization prompt to the tmux pane
+# The PA agent will handle extracting and saving to memory files
+tmux send-keys -t "$SESSION_NAME" \
+    "Please summarize this session for long-term memory. Extract key decisions, preferences learned, project context, and facts into the appropriate memory files in ~/.claude/state/personal-assistant/memory/. Then mark this session as summarized in the history index." \
+    Enter
+
+echo "Summarization request sent to PA session"