feat: add prompt based hooks (#795)

Co-authored-by: Letta <noreply@letta.com>

src/tests/settings-manager.test.ts

@@ -2,7 +2,19 @@ import { afterEach, beforeEach, describe, expect, test } from "bun:test";
 import { mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
+import type { CommandHookConfig, HookCommand } from "../hooks/types";
 import { settingsManager } from "../settings-manager";
+
+// Type-safe helper to extract command from a hook (tests only use command hooks)
+function asCommand(
+  hook: HookCommand | undefined,
+): CommandHookConfig | undefined {
+  if (hook && hook.type === "command") {
+    return hook as CommandHookConfig;
+  }
+  return undefined;
+}
+
 import {
   deleteSecureTokens,
   isKeychainAvailable,
@@ -558,7 +570,7 @@ describe("Settings Manager - Hooks", () => {
 
     const settings = settingsManager.getSettings();
     expect(settings.hooks?.PreToolUse).toHaveLength(1);
-    expect(settings.hooks?.PreToolUse?.[0]?.hooks[0]?.command).toBe(
+    expect(asCommand(settings.hooks?.PreToolUse?.[0]?.hooks[0])?.command).toBe(
       "echo persisted",
     );
     expect(settings.hooks?.SessionStart).toHaveLength(1);
@@ -631,7 +643,9 @@ describe("Settings Manager - Hooks", () => {
 
     expect(reloaded.hooks?.Stop).toHaveLength(1);
     // Simple event hooks are in SimpleHookMatcher format with hooks array
-    expect(reloaded.hooks?.Stop?.[0]?.hooks[0]?.command).toBe("echo stop-hook");
+    expect(asCommand(reloaded.hooks?.Stop?.[0]?.hooks[0])?.command).toBe(
+      "echo stop-hook",
+    );
   });
 
   test("All 11 hook event types can be configured", async () => {