feat: Execute zone - Playwright PC Web + Appium mobile + AI screenshot diff + test conclusion reports

- Add 3 new agents: web-executor, mobile-executor, result-reporter
- web-executor: Playwright multi-browser (Chromium/Firefox/WebKit) automated scripts
- mobile-executor: Appium dual-platform (Android/iOS) automated scripts
- result-reporter: pixel-level AI visual comparison + test conclusion report with screenshots
- Auto-generate executable Python test scripts from Markdown test cases
- Screenshot strategies: on-failure (default) + on-step (optional)
- Visual diff grading: <1% pass / 1-5% minor / 5-15% UI_DIFF / >15% blocker
- Failure multi-classification: REAL_BUG/UI_DIFF/ENV_ISSUE/DATA_ISSUE/CASE_BUG/SCRIPT_ERROR
- requirements.txt: add playwright + Pillow
- Fleet now: 17 agents across 6 battle zones

.claude/skills/qe_fleet/SKILL.md

@@ -34,6 +34,7 @@ python3 scripts/fleet_runner.py run --requirement <需求文档路径>
    - **PREPARE**: document-parser(文档解析) → knowledge-activator(知识激活)
    - **ANALYZE**: requirement-analyzer(需求分析) + conflict-detector(冲突检测) → risk-assessor(风险评估)
    - **DESIGN**: test-strategist(测试策略) → testpoint-designer(测试点) + data-builder(测试数据) → case-designer(用例设计)
+   - **EXECUTE**: web-executor(Playwright PC Web) + mobile-executor(Appium 移动端) → result-reporter(截图对比+结论)
    - **REVIEW**: case-reviewer(用例评审) + coverage-auditor(覆盖率审计) → quality-gatekeeper(质量裁决)
    - **MONITOR**: execution-analyst(执行分析) → knowledge-curator(知识沉淀)
    - **EXPORT**: 质量裁决 PASS 后自动导出 Excel
@@ -81,6 +82,11 @@ python3 scripts/fleet_runner.py monitor --requirement <需求文档路径> --res
 - **case-designer**: 可执行用例；原子性；双验证预期结果（UI + 数据）
 - **data-builder**: 自动提取+人工补充测试数据（账号/金额/ID/枚举/边界值）
 
+### Execute 战区
+- **web-executor**: 生成 Playwright 测试脚本；多浏览器（Chromium/Firefox/WebKit）；每步/失败自动截图
+- **mobile-executor**: 生成 Appium 测试脚本；Android (UiAutomator2) + iOS (XCUITest)；双平台截图采集
+- **result-reporter**: 截图 AI 视觉对比；像素级差异检测；多平台测试结论报告（含截图证据）
+
 ### Review 战区
 - **case-reviewer**: 按 review_checklist 逐项评审；错误分级（阻断/建议/优化）
 - **coverage-auditor**: 需求→测试点→用例三级追溯；覆盖缺口识别；过度覆盖识别