chore: 移除 goalAudit stub 及其测试引用

- 删除 src/services/goal/goalAudit.ts（导出 COMPLETION_AUDIT_RULES/BLOCKED_AUDIT_RULES/isGoalTerminal 等未引用的 stub）
- 同步移除 tests/integration/goal-lifecycle.test.ts 中对 goalAudit 的 import 和一个测试用例（budget_limited is terminal）

Co-Authored-By: glm-5.2 <zai-org@claude-code-best.win>

src/services/goal/goalAudit.ts

@@ -1,33 +0,0 @@
-/**
- * Audit rules constants for goal completion and blocked assessment.
- * Shared by prompt templates and integration tests.
- */
-import { BLOCKED_CONSECUTIVE_THRESHOLD, MAX_GOAL_TURNS } from './goalState.js'
-import type { GoalStatus } from '../../types/logs.js'
-
-export { BLOCKED_CONSECUTIVE_THRESHOLD, MAX_GOAL_TURNS }
-
-export const COMPLETION_AUDIT_RULES = [
-  'Derive concrete requirements from the objective and any referenced files.',
-  'Preserve the original scope — do not redefine success around what is already done.',
-  'For every explicit requirement, identify authoritative evidence (test output, file content, command result).',
-  'Treat tests, manifests, and verifiers as evidence only after confirming they actually cover the requirement.',
-  'Treat uncertain or indirect evidence as "not achieved".',
-  'The audit must PROVE completion, not merely fail to find remaining work.',
-] as const
-
-export const BLOCKED_AUDIT_RULES = [
-  'The same blocking condition must persist across at least 3 consecutive continuation turns.',
-  '"Difficult", "slow", or "partially incomplete" is NOT blocked.',
-  'Only genuinely insurmountable obstacles qualify (missing credentials, external service down, etc.).',
-] as const
-
-export function isGoalTerminal(status: GoalStatus): boolean {
-  return (
-    status === 'complete' ||
-    status === 'blocked' ||
-    status === 'budget_limited' ||
-    status === 'usage_limited' ||
-    status === 'max_turns'
-  )
-}