feat(hooks): integrate directory-agents-injector hook into plugin pipeline

- Add directoryAgentsInjector to plugin event handlers
- Wire up tool.execute.after hook for directory agents injection
- Fix: Format src/index.ts with consistent semicolon style

src/hooks/index.ts

@@ -6,3 +6,4 @@ export { createCommentCheckerHooks } from "./comment-checker";
 export { createGrepOutputTruncatorHook } from "./grep-output-truncator";
 export { createPulseMonitorHook } from "./pulse-monitor";
 export { createDirectoryAgentsInjectorHook } from "./directory-agents-injector";
+export { createEmptyTaskResponseDetectorHook } from "./empty-task-response-detector";