refactor(builder): type the AI-response/patch boundary

applyPatch's `ops` param was typed `any[]`, discarding the SitesmithPatchOp
discriminated union that SitesmithResponse.ops already carried at the call
site. Type it ops: SitesmithPatchOp[] so op.props/op.tree/op.op narrow
correctly per-variant in the switch instead of being `any`, and update the
unit tests' inline op literals to SitesmithPatchOp[] so tsc checks them too.

SerializedTreeNode/SitesmithPatchOp themselves, and buildNodeTree/
sanitizeAiTree's tree params, were already typed from a prior task -- this
closes the one remaining any at the op-handling site. Runtime validation
(protected-key guard, style-merge guard, unknown-resolvedName soft-skip) is
unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

craft/src/utils/apply-ai-response.test.ts

@@ -1,5 +1,6 @@
 import { describe, test, expect, vi } from 'vitest';
 import { sanitizeAiTree, __test } from './apply-ai-response';
+import type { SitesmithPatchOp } from '../types/sitesmith';
 
 describe('findNodeIdByAiNodeId', () => {
   const query = {
@@ -173,7 +174,7 @@ describe('applyPatch', () => {
       text: 'Old',
       style: { color: 'red', fontSize: '16px' },
     });
-    const ops = [
+    const ops: SitesmithPatchOp[] = [
       {
         op: 'update_props',
         node_id: 'ai-node-1',
@@ -194,7 +195,7 @@ describe('applyPatch', () => {
       text: 'Old',
       style: { color: 'red', fontSize: '16px' },
     });
-    const ops = [
+    const ops: SitesmithPatchOp[] = [
       {
         op: 'update_props',
         node_id: 'ai-node-1',
@@ -211,7 +212,7 @@ describe('applyPatch', () => {
     const { query, actions, propsById } = makeSingleNodeHarness('craft-1', 'ai-node-1', {
       style: { color: 'red', fontSize: '16px' },
     });
-    const ops = [
+    const ops: SitesmithPatchOp[] = [
       { op: 'update_props', node_id: 'ai-node-1', props: { style: { color: 'blue' } } },
     ];
     __test.applyPatch(actions, query, ops);
@@ -221,7 +222,7 @@ describe('applyPatch', () => {
   test('an op with an unknown resolvedName tree is skipped without throwing; other ops in the batch still apply', () => {
     const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
     const { query, actions, propsById } = makeSingleNodeHarness('craft-1', 'ai-node-1', {});
-    const ops = [
+    const ops: SitesmithPatchOp[] = [
       {
         op: 'insert_after',
         node_id: 'ai-node-1',