✨ feat(vscode): 测试提示词改成可配置模板并带上工单号

启动测试会话原先硬编码发 `/pr-acceptance-testing`，不带目标，验收技能只能
反问要测哪个。现在做成 prompts/test.md 模板 + 设置里的「测试提示词」，占位符
{issueNumber} 和 {prRef}（worktree 里是分支，主仓库里是已合并的 PR）。

Claude-Session: https://claude.ai/code/session_01Kgmb1LvrPmFX3NoUDB4zZC

vscode/src/settings/store.ts

@@ -30,9 +30,11 @@ const FALLBACK_BRAINSTORM_CONTINUE_PROMPT = `/ecc:grilling 讨论下 {issueNumbe
 
 const FALLBACK_IMPLEMENT_PLAN_PROMPT = `/ecc:tdd @{planFile} 按计划实施，编码派子代理，发起 PR 时在 body 中包含 "Closes #{issueNumber}"。严禁合并 PR。`
 
+const FALLBACK_TEST_PROMPT = `/pr-acceptance-testing 验收 {issueNumber} 号工单（{prRef}）。验收目标以工单正文为准，不要再问验收哪个。`
+
 const FALLBACK_REVIEW_PROMPT = `用 tea 拿到 #{prNumber} PR，diff 交给 ecc:code-reviewer 子代理审查。审查意见用 spx pr review-comment 发评论，body 第一行写 <!-- spx:review=1 -->。`
 
-type PromptName = 'brainstorm' | 'brainstorm-continue' | 'implement-plan' | 'review'
+type PromptName = 'brainstorm' | 'brainstorm-continue' | 'implement-plan' | 'review' | 'test'
 
 /**
  * Read a default prompt template from `${extensionPath}/prompts/${name}.md`.
@@ -54,6 +56,7 @@ export function readDefaultPrompt(extensionPath: string, name: PromptName): stri
       case 'brainstorm-continue': return FALLBACK_BRAINSTORM_CONTINUE_PROMPT
       case 'implement-plan': return FALLBACK_IMPLEMENT_PLAN_PROMPT
       case 'review': return FALLBACK_REVIEW_PROMPT
+      case 'test': return FALLBACK_TEST_PROMPT
     }
   }
 }
@@ -87,6 +90,8 @@ export interface Settings {
   autoReview: boolean
   /** Prompt template for the auto-review flow. `{prNumber}` placeholder. */
   reviewPrompt: string
+  /** 测试会话首个提示词模板；占位符 {issueNumber} / {prRef}。 */
+  testPrompt: string
   /** Day-to-day development branch (e.g. `main`). Jenkins doesn't watch it. */
   devBranch: string
   /**
@@ -266,6 +271,7 @@ function defaults(ctx: ExtensionContext): Settings {
     implementPlanPrompt: readDefaultPrompt(ctx.extensionPath, 'implement-plan'),
     autoReview: true,
     reviewPrompt: readDefaultPrompt(ctx.extensionPath, 'review'),
+    testPrompt: readDefaultPrompt(ctx.extensionPath, 'test'),
     devBranch: 'main',
     releaseBranchPrefix: 'release/',
     jenkinsJob: '',
@@ -319,6 +325,9 @@ export function getSettings(ctx: ExtensionContext): Settings {
   const reviewPrompt = typeof stored.reviewPrompt === 'string' && stored.reviewPrompt.length > 0
     ? stored.reviewPrompt
     : base.reviewPrompt
+  const testPrompt = typeof stored.testPrompt === 'string' && stored.testPrompt.length > 0
+    ? stored.testPrompt
+    : base.testPrompt
   // devBranch always has a usable value — fall back to 'main' if missing/blank
   // so we never end up trying to fetch the empty string.
   const devBranch = typeof stored.devBranch === 'string' && stored.devBranch.length > 0
@@ -424,6 +433,7 @@ export function getSettings(ctx: ExtensionContext): Settings {
     implementPlanPrompt,
     autoReview,
     reviewPrompt,
+    testPrompt,
     devBranch,
     releaseBranchPrefix,
     jenkinsJob,