refactor(hooks): split session-notification and unstable-agent-babysitter

Extract notification and babysitter logic:
- session-notification-formatting.ts, session-notification-scheduler.ts
- session-notification-sender.ts, session-todo-status.ts
- task-message-analyzer.ts: message analysis for babysitter hook

src/hooks/session-notification-formatting.ts

@@ -0,0 +1,25 @@
+export function escapeAppleScriptText(input: string): string {
+  return input.replace(/\\/g, "\\\\").replace(/"/g, '\\"')
+}
+
+export function escapePowerShellSingleQuotedText(input: string): string {
+  return input.replace(/'/g, "''")
+}
+
+export function buildWindowsToastScript(title: string, message: string): string {
+  const psTitle = escapePowerShellSingleQuotedText(title)
+  const psMessage = escapePowerShellSingleQuotedText(message)
+
+  return `
+[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null
+$Template = [Windows.UI.Notifications.ToastNotificationManager]::GetTemplateContent([Windows.UI.Notifications.ToastTemplateType]::ToastText02)
+$RawXml = [xml] $Template.GetXml()
+($RawXml.toast.visual.binding.text | Where-Object {$_.id -eq '1'}).AppendChild($RawXml.CreateTextNode('${psTitle}')) | Out-Null
+($RawXml.toast.visual.binding.text | Where-Object {$_.id -eq '2'}).AppendChild($RawXml.CreateTextNode('${psMessage}')) | Out-Null
+$SerializedXml = New-Object Windows.Data.Xml.Dom.XmlDocument
+$SerializedXml.LoadXml($RawXml.OuterXml)
+$Toast = [Windows.UI.Notifications.ToastNotification]::new($SerializedXml)
+$Notifier = [Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('OpenCode')
+$Notifier.Show($Toast)
+`.trim().replace(/\n/g, "; ")
+}