Revert "feat: add two-layer tool call validation system (proactive + reactive) (#249)"

This reverts commit 9bc2360d31.

src/hooks/index.ts

@@ -21,4 +21,3 @@ export { createKeywordDetectorHook } from "./keyword-detector";
 export { createNonInteractiveEnvHook } from "./non-interactive-env";
 export { createInteractiveBashSessionHook } from "./interactive-bash-session";
 export { createEmptyMessageSanitizerHook } from "./empty-message-sanitizer";
-export { createToolCallValidatorHook } from "./tool-call-validator";