[CI] Add unittest Claude skill and supplement unit test coverage

.claude/skills/write-fastdeploy-unittest/README.md

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+# write-fastdeploy-unittest
+
+English | [简体中文](README_CN.md)
+
+A skill that guides AI agents to write CI-compliant unit tests for the FastDeploy.
+
+## Features
+
+- Automatically selects the appropriate test pattern based on the code under test (pure logic / GPU kernel / offline inference / E2E serving)
+- Follows FastDeploy CI classification rules (multi-GPU sequential vs single-GPU parallel)
+- Meets the 80% diff coverage PR threshold
+- Correctly uses port variables, log isolation, and resource cleanup per CI conventions
+
+## Usage
+
+### Basic — specify a source file
+
+```
+Use the write-fastdeploy-unittest skill to add unit tests for fastdeploy/cache_manager/transfer_factory/file_store/file_store.py
+```
+
+### From coverage report — paste the line directly
+
+```
+Use the write-fastdeploy-unittest skill to add unit tests for:
+
+fastdeploy/model_executor/model_loader/default_loader.py    48  32  14  0  26%  37-38, 42, 46-52, 56-66, 69-97
+```
+
+The coverage report format is: `file_path  Stmts  Miss  Branch  BrMiss  Cover%  Missing_lines`. The agent will focus on the uncovered lines and write tests specifically targeting those branches.
+
+### From incremental coverage JSON — PR diff coverage check data
+
+```
+Use the write-fastdeploy-unittest skill to add unit tests for:
+
+"fastdeploy/worker/gpu_model_runner.py": {"percent_covered": 0.0, "violation_lines": [1398], "covered_lines": [], "violations": [[1398, null]]}
+```
+
+JSON field descriptions:
+- `percent_covered`: Incremental line coverage percentage
+- `violation_lines`: List of uncovered line numbers (target lines that need tests)
+- `covered_lines`: List of already-covered line numbers
+- `violations`: Violation details, format `[[line_number, branch_info]]`
+
+The agent will focus on lines in `violation_lines` and write tests specifically targeting those branches.
+
+### Workflow
+
+The agent will automatically:
+1. Read the target source file and analyze uncovered lines
+2. **Check if a test file already exists** (prefer appending test cases to existing files over creating new ones)
+3. Select the appropriate test pattern (Pattern 1-4)
+4. Append to existing test file, or generate a new test file in the corresponding `tests/` subdirectory
+5. Run tests and verify coverage
+
+## Test Pattern Quick Reference
+
+| Pattern | Use Case | Dependencies |
+|---------|----------|--------------|
+| 1 — Pure Logic | config, utils, scheduler, router, etc. | No GPU; mock external deps |
+| 2 — GPU Kernel | ops, layers, numerical computation | Requires GPU; `@pytest.mark.gpu` |
+| 3 — Offline Inference | LLM API, model loading | Requires MODEL_PATH |
+| 4 — E2E Serving | End-to-end HTTP serving | subprocess + ports |
+
+## Key Conventions
+
+- Test file naming: `test_<module>.py`
+- Test class naming: `Test<Module>`
+- Coverage verification: `python -m coverage run --source=<directory> -m pytest <test_file> && coverage report -m`
+- The `--source` parameter accepts directory paths (e.g., `fastdeploy/engine`) or top-level package names (e.g., `fastdeploy`). It does NOT accept dotted module paths like `fastdeploy.engine.module` or `.py` file paths.
+
+## Related Files
+
+- [SKILL.md](SKILL.md) — Full skill instruction document

.claude/skills/write-fastdeploy-unittest/README_CN.md

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+# write-fastdeploy-unittest
+
+[English](README.md) | 简体中文
+
+用于为 FastDeploy 生成符合 CI 规范的单元测试的 Skill。
+
+## 功能
+
+- 根据被测代码类型自动选择测试模式（纯逻辑 / GPU Kernel / 离线推理 / E2E 服务）
+- 遵循 FastDeploy CI 分类规则（multi-GPU 串行 vs single-GPU 并行）
+- 满足 80% diff coverage PR 门槛要求
+- 正确使用端口变量、日志隔离、资源清理等 CI 约定
+
+## 使用方式
+
+### 基础用法 — 指定源文件
+
+```
+使用 write-fastdeploy-unittest skill，为 fastdeploy/cache_manager/transfer_factory/file_store/file_store.py 补充单测
+```
+
+### 从覆盖率报告 — 直接粘贴覆盖率行
+
+```
+使用 write-fastdeploy-unittest skill，为以下文件补充单测：
+
+fastdeploy/model_executor/model_loader/default_loader.py    48  32  14  0  26%  37-38, 42, 46-52, 56-66, 69-97
+```
+
+覆盖率报告格式为：`文件路径  语句总数  未覆盖语句数  分支总数  未覆盖分支数  覆盖率%  未覆盖行号`。Agent 会聚焦未覆盖的行，针对性地编写测试。
+
+### 从增量覆盖率 JSON — PR diff coverage 检查数据
+
+```
+使用 write-fastdeploy-unittest skill，为以下文件补充单测：
+
+"fastdeploy/worker/gpu_model_runner.py": {"percent_covered": 0.0, "violation_lines": [1398], "covered_lines": [], "violations": [[1398, null]]}
+```
+
+JSON 格式字段说明：
+- `percent_covered`：增量行覆盖率百分比
+- `violation_lines`：未覆盖的行号列表（需要补测的目标行）
+- `covered_lines`：已覆盖的行号列表
+- `violations`：详情，格式为 `[[行号, 分支信息]]`
+
+Agent 会聚焦 `violation_lines` 中的行号，针对性地编写测试覆盖这些分支。
+
+### 工作流程
+
+Agent 会自动完成：
+1. 读取目标源文件，分析未覆盖行的逻辑
+2. **检查是否已有对应的测试文件**（优先在已有文件上追加 test case，避免重复建文件）
+3. 选择合适的测试 Pattern（Pattern 1-4）
+4. 在已有测试文件中追加，或在 `tests/` 对应子目录下新建测试文件
+5. 运行测试并验证覆盖率
+
+## 测试 Pattern 速查
+
+| Pattern | 适用场景 | 依赖 |
+|---------|----------|------|
+| 1 — Pure Logic | config、utils、scheduler、router 等 | 无 GPU，mock 外部依赖 |
+| 2 — GPU Kernel | ops、layers、数值计算 | 需要 GPU，`@pytest.mark.gpu` |
+| 3 — Offline Inference | LLM API、模型加载 | 需要 MODEL_PATH |
+| 4 — E2E Serving | HTTP 服务端到端 | subprocess + 端口 |
+
+## 关键约定
+
+- 测试文件命名：`test_<module>.py`
+- 测试类命名：`Test<Module>`
+- 覆盖率验证：`python -m coverage run --source=<目录路径> -m pytest <测试文件> && coverage report -m`
+- `--source` 参数接受目录路径（如 `fastdeploy/engine`）或顶层包名（如 `fastdeploy`），不接受点分模块路径（如 `fastdeploy.engine.module`）或 `.py` 文件路径
+
+## 相关文件
+
+- [SKILL.md](SKILL.md) — 完整的 skill 指令文档