refactor: 精简系统提示词 — 合并沟通风格段落、精简 memory/工具描述、截断 gitStatus

- 合并 getOutputEfficiencySection + getSimpleToneAndStyleSection 为精简的 Communication style
- 精简 auto memory 指令：删除 4 种类型的详细说明和示例，仅保留核心 description
- 精简 Agent 工具：删除 forkExamples 和 currentExamples 大段示例
- 精简 Bash 工具：合并 sleep 相关指导
- 精简 EnterPlanMode/ExitPlanMode：删除详细 GOOD/BAD 示例
- gitStatus MAX_STATUS_CHARS 从 2000 降到 1000
- 同步更新 prompt engineering audit 测试断言

Co-Authored-By: glm-5-turbo <zai-org@claude-code-best.win>

src/context.ts

@@ -17,7 +17,7 @@ import { getBranch, getDefaultBranch, getIsGit, gitExe } from './utils/git.js'
 import { shouldIncludeGitInstructions } from './utils/gitSettings.js'
 import { logError } from './utils/log.js'
 
-const MAX_STATUS_CHARS = 2000
+const MAX_STATUS_CHARS = 1000
 
 // System prompt injection for cache breaking (ant-only, ephemeral debugging state)
 let systemPromptInjection: string | null = null