feat(config-editor): add RecordValue serializer with tests

extensions/pixelhero-config-editor/__tests__/.gitignore

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+.tmp/

extensions/pixelhero-config-editor/__tests__/recordValue.serializer.test.ts

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+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { serializeValue, serializeEntry } from '../src/io/serializer';
+import { RecordValue } from '../src/io/recordValue';
+
+test('serializeValue: num/str/bool', () => {
+  assert.equal(serializeValue({ kind: 'num', value: 400 }), '400');
+  assert.equal(serializeValue({ kind: 'str', value: '小铁卫' }), '"小铁卫"');
+  assert.equal(serializeValue({ kind: 'bool', value: true }), 'true');
+});
+test('serializeValue: enumRef', () => {
+  const v: RecordValue = { kind: 'enumRef', qualifier: 'FacSet', member: 'HERO' };
+  assert.equal(serializeValue(v), 'FacSet.HERO');
+});
+test('serializeValue: speed', () => {
+  const v: RecordValue = { kind: 'speed', level: 'Slow3' };
+  assert.equal(serializeValue(v), 'AtkSpeedSet[AtkSpeedLv.Slow3].cd');
+});
+test('serializeValue: arr', () => {
+  const v: RecordValue = { kind: 'arr', items: [{ kind: 'num', value: 1 }, { kind: 'num', value: 2 }] };
+  assert.equal(serializeValue(v), '[1,2]');
+});
+test('serializeValue: obj', () => {
+  const v: RecordValue = { kind: 'obj', props: { a: { kind: 'num', value: 1 }, b: { kind: 'str', value: 'x' } } };
+  assert.equal(serializeValue(v), '{a:1,b:"x"}');
+});
+test('serializeValue: raw passthrough', () => {
+  const v: RecordValue = { kind: 'raw', text: 'a + b' };
+  assert.equal(serializeValue(v), 'a + b');
+});
+test('serializeEntry: all-scalar one line with trailing comma', () => {
+  const v: RecordValue = { kind: 'obj', props: { uuid: { kind: 'num', value: 1 }, name: { kind: 'str', value: 'x' } } };
+  assert.equal(serializeEntry('1', v), '1:{uuid:1,name:"x"},');
+});
+test('serializeEntry: nested on continuation lines', () => {
+  const v: RecordValue = { kind: 'obj', props: {
+    uuid: { kind: 'num', value: 5011 },
+    skills: { kind: 'obj', props: { 6001: { kind: 'obj', props: { uuid: { kind: 'num', value: 6001 } } } } },
+  } };
+  const out = serializeEntry('5011', v);
+  assert.match(out, /^5011:\{uuid:5011,$/m);                     // 首行：键 + 标量
+  assert.match(out, /        skills:\{6001:\{uuid:6001\}\},$/m); // 续行 8 空格
+  assert.match(out, /^    \},$/m);                               // 闭合 4 空格
+});