feat(babysitting): make unstable-agent-babysitter always-on by default

Remove the 'enabled' flag from babysitting config - the hook now runs
automatically when not disabled via disabled_hooks. This simplifies
configuration and makes the unstable model monitoring a default behavior.

BREAKING CHANGE: babysitting.enabled config option is removed. Use
disabled_hooks: ['unstable-agent-babysitter'] to disable the hook instead.

src/index.ts

@@ -291,9 +291,8 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       })
     : null;
 
-  const unstableAgentBabysitter =
-    isHookEnabled("unstable-agent-babysitter") && pluginConfig.babysitting?.enabled === true
-      ? createUnstableAgentBabysitterHook(
+  const unstableAgentBabysitter = isHookEnabled("unstable-agent-babysitter")
+    ? createUnstableAgentBabysitterHook(
           {
             directory: ctx.directory,
             client: {