✨ feat(vscode): 重写注释留会话记录、能接着说，允许画原型图

每块的重写记录存进 .spx/comment-rewrites.json（和问答分开，改名、删文件跟着走），块下面同问答区：灰字历史、当前这一轮、输入框；输入框里的话接着这块最近一次重写的会话说，交回新正文照样写回，写回失败也记下原因。
重写跑在 claude --restricted 下：只放开读搜、OpenPencil 的 op、建 prototypes 目录、改草稿目录，写注释的插件单独加载；超时 15 分钟。
进行中的、出错被叫停留着的那一轮记在扩展端，切走标签页再切回来照样接上（问 AI 同一套）。

vscode/src/codeReader/qa/qaMap.test.ts

@@ -1,4 +1,4 @@
-import type { QaEntry, QaMap } from './qaMap'
+import type { QaEntry, QaMap, RewriteEntry, RewriteMap } from './qaMap'
 import { Buffer } from 'node:buffer'
 import { promises as fsp } from 'node:fs'
 import * as os from 'node:os'
@@ -6,7 +6,7 @@ import * as path from 'node:path'
 import { afterEach, beforeEach, describe, expect, it } from 'vitest'
 import { detachedFiles, dropEntries, moveEntries, readPathMap, removeFiles, writePathMap } from '../pathMap'
 import { writeQaImages } from './qaImages'
-import { latestSession, QA_FILE, withEntry, withoutEntry } from './qaMap'
+import { latestSession, QA_FILE, REWRITE_FILE, withEntry, withoutEntry } from './qaMap'
 
 function entry(id: string, createdAt: string, question = `问 ${id}`): QaEntry {
   return { id, question, answer: `答 ${id}`, createdAt, sessionId: `s-${id}` }
@@ -177,8 +177,8 @@ describe('问题带的图片', () => {
   })
 
   it('删一次问答，它的图片跟着删；别的问答的图片留着', async () => {
-    const a = { ...entry('a', '2026-09-25T10:00:00.000Z'), images: await writeQaImages(root, 'a', [png('a1'), png('a2')]) }
-    const b = { ...entry('b', '2026-09-26T10:00:00.000Z'), images: await writeQaImages(root, 'b', [png('b1')]) }
+    const a: QaEntry = { ...entry('a', '2026-09-25T10:00:00.000Z'), images: await writeQaImages(root, 'a', [png('a1'), png('a2')]) }
+    const b: QaEntry = { ...entry('b', '2026-09-26T10:00:00.000Z'), images: await writeQaImages(root, 'b', [png('b1')]) }
     await update(map => withEntry(withEntry(map, 'a.py', IF, a), 'a.py', DISPLAY, b))
     expect(await exists(imageFile('a-1.png'))).toBe(true)
     await update(map => withoutEntry(map, 'a.py', IF, 'a'))
@@ -188,7 +188,7 @@ describe('问题带的图片', () => {
   })
 
   it('源文件删了、问答跟着删时图片也删；改名、挪位置按问答 id 起的名字不用动', async () => {
-    const a = { ...entry('a', '2026-09-25T10:00:00.000Z'), images: await writeQaImages(root, 'a', [png('a1')]) }
+    const a: QaEntry = { ...entry('a', '2026-09-25T10:00:00.000Z'), images: await writeQaImages(root, 'a', [png('a1')]) }
     await update(map => withEntry(map, 'src/a.py', IF, a))
     await update(map => moveEntries(map, 'src', 'lib'))
     expect(await readPathMap(root, QA_FILE)).toEqual({ 'lib/a.py': [{ anchor: IF, entries: [a] }] })
@@ -197,3 +197,47 @@ describe('问题带的图片', () => {
     expect(await exists(imageFile('a-1.png'))).toBe(false)
   })
 })
+
+describe('重写注释的记录：另存一份，和问答分开', () => {
+  const rewriteFile = (): string => path.join(root, '.spx', 'comment-rewrites.json')
+  const exists = (file: string): Promise<boolean> => fsp.access(file).then(() => true, () => false)
+
+  function rewrite(id: string, createdAt: string, extra: Partial<RewriteEntry> = {}): RewriteEntry {
+    return { id, question: '/ecc:writing-code-comments a.py:3-8', body: `正文 ${id}`, createdAt, sessionId: `r-${id}`, ...extra }
+  }
+
+  it('存在 .spx/comment-rewrites.json，不进问答那份；正文、没写进文件的原因跟着这条读得回来，接着最近一次重写的会话', async () => {
+    const map: RewriteMap = withEntry(withEntry({}, 'a.py', IF, rewrite('a', '2026-09-25T10:00:00.000Z')), 'a.py', IF, rewrite('b', '2026-09-26T10:00:00.000Z', { error: '这段注释的定界符认不出来，没有改文件。' }))
+    await writePathMap(root, REWRITE_FILE, map)
+    expect(await exists(rewriteFile())).toBe(true)
+    expect(await exists(qaFile())).toBe(false)
+    expect(await readPathMap(root, REWRITE_FILE)).toEqual(map)
+    expect(await readPathMap(root, QA_FILE)).toEqual({})
+    expect(latestSession(map['a.py'], IF)).toBe('r-b')
+  })
+
+  it('模型没交回正文的那次只记原因；正文和原因都没有、正文是空的不认', async () => {
+    await fsp.mkdir(path.dirname(rewriteFile()), { recursive: true })
+    const silent = rewrite('s', '2026-09-25T10:00:00.000Z', { error: '模型没有按要求交回注释正文，没有改文件。' })
+    delete silent.body
+    await fsp.writeFile(rewriteFile(), JSON.stringify({ 'a.py': [{ anchor: IF, entries: [
+      silent,
+      { ...rewrite('bare', '2026-09-25T11:00:00.000Z'), body: undefined },
+      rewrite('blank', '2026-09-25T12:00:00.000Z', { body: '  ' }),
+    ] }] }), 'utf8')
+    expect(await readPathMap(root, REWRITE_FILE)).toEqual({ 'a.py': [{ anchor: IF, entries: [silent] }] })
+  })
+
+  it('带的图片和问答的放在同一个目录，删一条重写记录只删它自己的', async () => {
+    const png = { mediaType: 'image/png', base64: Buffer.from('r').toString('base64') }
+    const image = path.join(root, '.spx', 'code-qa', 'r-1.png')
+    const withImage = rewrite('r', '2026-09-25T10:00:00.000Z', { images: await writeQaImages(root, 'r', [png]) })
+    const before = withEntry({}, 'a.py', IF, withImage)
+    await writePathMap(root, REWRITE_FILE, before)
+    expect(await readPathMap(root, REWRITE_FILE)).toEqual(before)
+    const after = withoutEntry(before, 'a.py', IF, 'r')
+    await writePathMap(root, REWRITE_FILE, after)
+    await removeFiles(root, detachedFiles(REWRITE_FILE, before, after))
+    expect(await exists(image)).toBe(false)
+  })
+})