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-todo-status.ts

@@ -0,0 +1,19 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+
+interface Todo {
+  content: string
+  status: string
+  priority: string
+  id: string
+}
+
+export async function hasIncompleteTodos(ctx: PluginInput, sessionID: string): Promise<boolean> {
+  try {
+    const response = await ctx.client.session.todo({ path: { id: sessionID } })
+    const todos = (response.data ?? response) as Todo[]
+    if (!todos || todos.length === 0) return false
+    return todos.some((todo) => todo.status !== "completed" && todo.status !== "cancelled")
+  } catch {
+    return false
+  }
+}