Add anvillm-notify script for session state change notifications

- Add anvillm-notify script that polls session state files
- Sends desktop notification when session transitions running→idle
- Update mkfile with notify target
- Expose state via 9p in main.go
- Remove notification idea from IDEAS.md (implemented)

IDEAS.md

@@ -11,16 +11,6 @@ Implementation sketch:
 - Extract selected text from current window as the prompt
 - Send prompt to the target session's tmux pane via `tmux send-keys`
 
-## Notification on State Change
-
-External polling script monitors 9p state files. When state changes from "running" to "idle", send desktop notification: "session {id} ({alias}) completed its work."
-
-Implementation sketch:
-- Poll `/mnt/anvillm/sessions/*/state` periodically
-- Track previous state per session
-- On transition running→idle, call `notify-send` or similar
-- Bonus: watch all sessions, report which one finished
-
 ## Shared Context
 
 Inject context from one session into another.

anvillm-notify

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+# Poll all anvillm sessions and notify on running->idle transitions
+
+# Track previous states: session_id=state
+prev_states=""
+
+get_sessions() {
+	9p read agent/list 2>/dev/null | awk '{print $1}'
+}
+
+get_state() {
+	9p read "agent/$1/state" 2>/dev/null
+}
+
+get_alias() {
+	9p read "agent/$1/alias" 2>/dev/null
+}
+
+get_prev() {
+	echo "$prev_states" | tr ' ' '\n' | grep "^$1=" | cut -d= -f2
+}
+
+set_prev() {
+	prev_states=$(echo "$prev_states" | tr ' ' '\n' | grep -v "^$1=" | tr '\n' ' ')
+	prev_states="$prev_states $1=$2"
+}
+
+while true; do
+	for id in $(get_sessions); do
+		[ -z "$id" ] && continue
+		state=$(get_state "$id")
+		prev=$(get_prev "$id")
+		
+		if [ "$prev" = "running" ] && [ "$state" = "idle" ]; then
+			name=$(get_alias "$id")
+			[ -z "$name" ] && name=$id
+			notify-send "session $name completed its work"
+		fi
+		
+		set_prev "$id" "$state"
+	done
+	sleep 1
+done

main.go

@@ -60,6 +60,15 @@ func main() {
 	}
 	defer srv.Close()
 
+	// Start notification daemon in background
+	notifyCmd := exec.Command("anvillm-notify")
+	notifyCmd.Start()
+	defer func() {
+		if notifyCmd.Process != nil {
+			notifyCmd.Process.Kill()
+		}
+	}()
+
 	// Rename chat window when alias changes
 	var aliasChangeFunc func(Session)
 	aliasChangeFunc = func(sess Session) {

mkfile

@@ -4,6 +4,8 @@ all:V: install
 
 build:V:
 	go build -o $INSTALL_PATH/Assist .
+	cp anvillm-notify $INSTALL_PATH/anvillm-notify
+	chmod +x $INSTALL_PATH/anvillm-notify
 
 install:V: build