docs(i18n): restore prompt-v4 as the pipeline baseline

按 jingtingxiang 拍板将 prompt 回到 v4 基线：模板正文恢复内嵌的
格式/语气/句式/词汇/标点全量约束与 11 组正误例（量词规则按术语表
现行裁定 package→包 写作「由三个包构成的 seam」），不再注入
translation-rules.md——该文件约束人和 agent，不进模板；占位符收敛
为 source_lang/target_lang/terminology 三个，切换行由模型按文档
自身拼写。渲染器、解析器、conformance 门禁与单测同步回 v4 契约：
三段裸 XML（translation/review/final 顺序唯一），容忍整体 ```xml
围栏回显；saxes 依赖随 CDATA 协议一并移除。

scripts/translation-prompt.ts

@@ -1,20 +1,16 @@
 /**
- * Executable renderer and strict response parser for the committed
- * documentation-translation prompt contract.
+ * Executable renderer and response parser for the committed
+ * documentation-translation prompt contract (prompt-v4).
+ *
+ * The v4 contract: three placeholders (`source_lang`, `target_lang`,
+ * `terminology`), whole-document translation, and a three-section response
+ * (`<translation>`, `<review>`, `<final>` in order, bare XML tags with raw
+ * Markdown bodies). The switcher filename is spelled out by the model from
+ * the document itself; the pipeline injects no other repository file.
  */
 
-import { basename } from 'node:path'
-import { SaxesParser } from 'saxes'
-
 /** Placeholder names supported by the committed translation prompt. */
-export const TRANSLATION_PROMPT_PLACEHOLDERS = [
-  'source_lang',
-  'target_lang',
-  'translation_rules',
-  'terminology',
-  'source_filename',
-  'source_filename_zh',
-] as const
+export const TRANSLATION_PROMPT_PLACEHOLDERS = ['source_lang', 'target_lang', 'terminology'] as const
 
 type TranslationPromptPlaceholder = (typeof TRANSLATION_PROMPT_PLACEHOLDERS)[number]
 
@@ -24,15 +20,11 @@ type TranslationLanguage = 'English' | 'Chinese'
 /** Inputs that vary for one rendered translation request. */
 export interface TranslationPromptInput {
   sourceLanguage: TranslationLanguage
-  /** Source basename, including `.md` or `.zh.md`. */
-  sourceFilename: string
-  /** Complete current `translation-rules.md` contents. */
-  translationRules: string
   /** Complete current `terminology.md` contents. */
   terminology: string
 }
 
-/** Parsed contents of the three-element XML response. */
+/** Parsed contents of the three-section response. */
 export interface TranslationResponse {
   translation: string
   review: string
@@ -42,7 +34,7 @@ export interface TranslationResponse {
 const PLACEHOLDER = /{{([a-z_]+)}}/g
 const TEMPLATE_OPEN = '## 模板正文\n\n````text\n'
 const TEMPLATE_CLOSE = '\n````'
-const RESPONSE_CHILDREN = ['translation', 'review', 'final'] as const
+const RESPONSE_SECTIONS = ['translation', 'review', 'final'] as const
 
 /** Extract the machine-consumed text fence from `translation-prompt.md`. */
 function extractTranslationPrompt(document: string): string {
@@ -61,31 +53,15 @@ export function documentedTranslationPromptPlaceholders(document: string): strin
   return [...document.slice(0, preambleEnd).matchAll(/^\| `{{([a-z_]+)}}` \|/gm)].map(match => match[1] ?? '')
 }
 
-/** Render one system prompt from the checked-in template and canonical rules. */
+/** Render one system prompt from the checked-in template. */
 export function renderTranslationPrompt(document: string, input: TranslationPromptInput): string {
-  if (basename(input.sourceFilename) !== input.sourceFilename) {
-    throw new Error(`translation prompt: sourceFilename must be a basename; got ${JSON.stringify(input.sourceFilename)}`)
-  }
-  const sourceIsChinese = input.sourceFilename.endsWith('.zh.md')
-  if (input.sourceLanguage === 'Chinese' ? !sourceIsChinese : sourceIsChinese || !input.sourceFilename.endsWith('.md')) {
-    throw new Error(`translation prompt: ${input.sourceFilename} does not match source language ${input.sourceLanguage}`)
-  }
-
   const targetLanguage: TranslationLanguage = input.sourceLanguage === 'English' ? 'Chinese' : 'English'
-  const sourceFilenameZh = sourceIsChinese ? input.sourceFilename : input.sourceFilename.replace(/\.md$/, '.zh.md')
   const values: Record<TranslationPromptPlaceholder, string> = {
     source_lang: input.sourceLanguage,
     target_lang: targetLanguage,
-    translation_rules: input.translationRules,
     terminology: input.terminology,
-    source_filename: input.sourceFilename,
-    source_filename_zh: sourceFilenameZh,
   }
   const template = extractTranslationPrompt(document)
-  const placeholderFreeTemplate = template.replace(PLACEHOLDER, '')
-  if (placeholderFreeTemplate.includes('{{') || placeholderFreeTemplate.includes('}}')) {
-    throw new Error('translation prompt: template contains malformed placeholder syntax')
-  }
   const names = [...template.matchAll(PLACEHOLDER)].map(match => match[1] ?? '')
   const unknown = names.filter(name => !TRANSLATION_PROMPT_PLACEHOLDERS.includes(name as TranslationPromptPlaceholder))
   if (unknown.length > 0) throw new Error(`translation prompt: unsupported placeholder(s): ${[...new Set(unknown)].join(', ')}`)
@@ -95,77 +71,37 @@ export function renderTranslationPrompt(document: string, input: TranslationProm
   return template.replace(PLACEHOLDER, (_token, name: string) => values[name as TranslationPromptPlaceholder])
 }
 
-/** Escape one value so it remains byte-identical inside an XML CDATA field. */
-function escapeTranslationCdata(value: string): string {
-  return value.replaceAll(']]>', ']]]]><![CDATA[>')
-}
-
-/** Serialize a response using the exact XML wire contract in the prompt. */
+/** Serialize a response in the exact three-section shape the prompt requests. */
 export function renderTranslationResponse(response: TranslationResponse): string {
-  return [
-    '<dsh-translation-response version="1">',
-    `<translation><![CDATA[${escapeTranslationCdata(response.translation)}]]></translation>`,
-    `<review><![CDATA[${escapeTranslationCdata(response.review)}]]></review>`,
-    `<final><![CDATA[${escapeTranslationCdata(response.final)}]]></final>`,
-    '</dsh-translation-response>',
-  ].join('\n')
+  return RESPONSE_SECTIONS.map(section => `<${section}>\n${response[section]}\n</${section}>`).join('\n\n')
 }
 
-/** Parse and validate the exact XML response shape emitted by the model. */
-export function parseTranslationResponse(xml: string): TranslationResponse {
-  const values: TranslationResponse = { translation: '', review: '', final: '' }
-  const stack: string[] = []
-  const cdataFields = new Set<string>()
-  let rootSeen = false
-  let childIndex = 0
-  const fail = (message: string): never => {
-    throw new Error(`translation response: ${message}`)
-  }
-  const parser = new SaxesParser({ xmlns: false })
+/**
+ * Parse the three-section response. Sections must each appear exactly once
+ * and in order; bodies are raw Markdown taken verbatim between the tags.
+ * A fenced ```xml wrapper around the whole response is tolerated, matching
+ * the shape some models echo back from the prompt's own example.
+ */
+export function parseTranslationResponse(text: string): TranslationResponse {
+  let body = text.trim()
+  const fenced = /^```(?:xml)?\n([\s\S]*?)\n```$/.exec(body)
+  if (fenced?.[1] !== undefined) body = fenced[1].trim()
 
-  parser.on('opentag', (tag) => {
-    if (stack.length === 0) {
-      if (rootSeen) fail('contains more than one root element')
-      if (tag.name !== 'dsh-translation-response') fail(`expected dsh-translation-response root, got ${tag.name}`)
-      const attributes = Object.keys(tag.attributes)
-      if (attributes.length !== 1 || tag.attributes.version !== '1') fail('root must have only version="1"')
-      rootSeen = true
-    } else if (stack.length === 1) {
-      const expected = RESPONSE_CHILDREN[childIndex]
-      if (tag.name !== expected) fail(`expected ${expected ?? 'no more children'}, got ${tag.name}`)
-      if (Object.keys(tag.attributes).length !== 0) fail(`${tag.name} must not have attributes`)
-      childIndex++
-    } else {
-      fail(`nested element ${tag.name} is not allowed`)
-    }
-    stack.push(tag.name)
-  })
-  parser.on('text', (value) => {
-    if (stack.length <= 1 && value.trim() === '') return
-    fail('all response field content must be inside CDATA')
-  })
-  parser.on('cdata', (value) => {
-    const field = stack.at(-1)
-    if (field === undefined || !RESPONSE_CHILDREN.includes(field as (typeof RESPONSE_CHILDREN)[number])) {
-      fail('CDATA is allowed only inside translation, review, or final')
-    }
-    const key = field as (typeof RESPONSE_CHILDREN)[number]
-    values[key] += value
-    cdataFields.add(key)
-  })
-  parser.on('closetag', (tag) => {
-    const expected = stack.pop()
-    if (expected !== tag.name) fail(`closing ${tag.name} does not match ${expected ?? 'nothing'}`)
-  })
-  parser.on('comment', () => fail('comments are not allowed'))
-  parser.on('doctype', () => fail('doctypes are not allowed'))
-  parser.on('processinginstruction', () => fail('processing instructions are not allowed'))
-  parser.on('error', error => fail(`invalid XML: ${error.message}`))
-  parser.write(xml).close()
-
-  if (childIndex !== RESPONSE_CHILDREN.length) fail('translation, review, and final must each appear exactly once and in order')
-  for (const field of RESPONSE_CHILDREN) {
-    if (!cdataFields.has(field)) fail(`${field} must contain a CDATA section`)
+  const values: Partial<Record<(typeof RESPONSE_SECTIONS)[number], string>> = {}
+  let cursor = 0
+  for (const section of RESPONSE_SECTIONS) {
+    const open = `<${section}>`
+    const close = `</${section}>`
+    const start = body.indexOf(open, cursor)
+    if (start === -1) throw new Error(`translation response: missing <${section}> section`)
+    const end = body.indexOf(close, start + open.length)
+    if (end === -1) throw new Error(`translation response: unterminated <${section}> section`)
+    values[section] = body.slice(start + open.length, end).replace(/^\n/, '').replace(/\n$/, '')
+    cursor = end + close.length
   }
-  return values
+  for (const section of RESPONSE_SECTIONS) {
+    const again = body.indexOf(`<${section}>`, cursor)
+    if (again !== -1) throw new Error(`translation response: duplicate <${section}> section`)
+  }
+  return values as TranslationResponse
 }