fix: boulder continuation now respects /stop-continuation guard

Add isContinuationStopped check to atlas hook's session.idle handler
so boulder continuation stops when user runs /stop-continuation.

Previously, todo continuation and session recovery checked the guard,
but boulder continuation did not — causing work to resume after stop.

Fixes #1575

src/index.ts

@@ -335,7 +335,11 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
   );
 
   const atlasHook = isHookEnabled("atlas")
-    ? safeCreateHook("atlas", () => createAtlasHook(ctx, { directory: ctx.directory, backgroundManager }), { enabled: safeHookEnabled })
+    ? safeCreateHook("atlas", () => createAtlasHook(ctx, { 
+        directory: ctx.directory, 
+        backgroundManager,
+        isContinuationStopped: (sessionID: string) => stopContinuationGuard?.isStopped(sessionID) ?? false,
+      }), { enabled: safeHookEnabled })
     : null;
 
   initTaskToastManager(ctx.client);