refactor(examples): wrap the two in-repo hook examples in defineHook() (#17532)

`examples/app-crm/src/hooks/opportunity.hook.ts` and
`examples/app-todo/src/objects/task.hook.ts` were the only two real
lifecycle hooks in the repository and both used the bare `: Hook`
literal form, which the published data skill teaches against. Every
field inside each object is byte-identical; only the import, the
opening line and the closing brace move.

Claude-Session: https://claude.ai/code/session_01MkQhmuuJAVDjmeWNixwDDH

Co-authored-by: Claude <noreply@anthropic.com>

Author: os-bill

examples/app-crm/src/hooks/opportunity.hook.ts

@@ -1,12 +1,12 @@
 // Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
 
-import type { Hook, HookContext } from '@objectstack/spec/data';
+import { defineHook, type HookContext } from '@objectstack/spec/data';
 
 /**
  * Pin the probability to 100% when an opportunity is marked Closed Won,
  * and 0% when Closed Lost. Demonstrates a basic before-update hook.
  */
-export const OpportunityStageHook: Hook = {
+export const OpportunityStageHook = defineHook({
   name: 'opportunity_stage_probability',
   object: 'crm_opportunity',
   events: ['beforeInsert', 'beforeUpdate'],
@@ -16,4 +16,4 @@ export const OpportunityStageHook: Hook = {
     if (input.stage === 'closed_won') input.probability = 100;
     if (input.stage === 'closed_lost') input.probability = 0;
   },
-};
+});

examples/app-todo/src/objects/task.hook.ts

@@ -1,6 +1,6 @@
 // Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
 
-import { HookContext, Hook } from '@objectstack/spec/data';
+import { defineHook, type HookContext } from '@objectstack/spec/data';
 
 /**
  * Lifecycle logic for `todo_task` — insert defaults and the completion stamp.
@@ -47,7 +47,7 @@ import { HookContext, Hook } from '@objectstack/spec/data';
  * timestamp that every report and list view reads as fact. The same
  * `readonly`/strip reasoning applies — only a hook can write the clear.
  */
-const taskHook: Hook = {
+const taskHook = defineHook({
   name: 'task_logic',
   object: 'todo_task',
   events: ['beforeInsert', 'beforeUpdate', 'afterUpdate'],
@@ -120,6 +120,6 @@ const taskHook: Hook = {
       // runs daily and selects on `due_date` directly.
     }
   }
-};
+});
 
 export default taskHook;