Add advanced eBPF tutorials 51–54 and tutorial agent skills (#220)

* Add targeted TCP connection quarantine tool

* Document TCP quarantine workflow

* Refresh package indexes before CI install

* Document TCP quarantine namespace scope

* Require BPF events for TCP iterator

* Add production fsession latency tracer

* Document fsession latency workflow

* Reject empty fsession CLI values

* Preserve successful fsession exit status

* Document fsession deadline regression test

* Drain fsession events before summary

* Document fsession PID and shutdown semantics

* Simplify fsession polling control flow

* Add bounded BPF egress pacer tutorial

* Test queued packet cleanup on signal

* Document the BPF egress pacer

* Polish and review the BPF egress pacer

* Refactor egress pacer option parsing

* Add executable image inspector lesson

* Build the exec image inspector in CI

* Document executable image inspection

* Handle re-exec chains in the image inspector

* Polish exec image inspector guidance

* Reduce exec inspector wait complexity

* Rewrite the egress pacer tutorial

* Rewrite the exec image inspector tutorial

* Polish the exec image inspector tutorial

* Correct the egress pacer tutorial

* Make the exec tutorial Chinese natural

* Fix egress tutorial prose checks

* Finish the exec tutorial style pass

* Clarify exec tutorial runtime evidence

* Polish exec tutorial scope wording

* Rewrite the egress pacer tutorial for readers

* Regenerate tutorial indexes

* Teach the egress pacer component by component

* Use standard Markdown in the egress tutorial

* Strengthen the egress pacer tutorial narrative

* jiji

* Use positive framing in the egress tutorial

* Rewrite the exec image inspector tutorial

* Rewrite the TCP quarantine tutorial

* Add the egress pacer lifecycle diagram

* Refresh TCP tutorial indexes

* Add the exec image inspection flow diagram

* Use one source directory link

* Rewrite the fsession latency tutorial

* Add fsession feature background

* Add BPF qdisc feature background

* Add TCP iterator feature background

* Add exec inspection feature background

* Require feature background in tutorial openings

* Polish fsession background prose

* Simplify repository tutorial skills

* Update exec inspector tooling revisions

* Restructure tutorials 51-54 following advanced guideline

- Update SKILL.md with strict section ordering and "why" requirements
- Rewrite README.zh.md for tutorials 51-54:
  - Add background sections explaining why traditional approaches fail
  - Move compilation/execution sections after code analysis
  - Add high-level mechanism explanation before code
  - Use paragraph style instead of bullet lists

* Consolidate skill guidelines and remove duplicates

- Update write-bpf-production-tutorial skill to reference 47, 48, 49
- Add structure requirements section with "Why" section emphasis
- Remove duplicate advanced-tutorial-guidelines.md (use scripts/guideline_advance.md instead)

* Rewrite English READMEs 51-54 to match Chinese structure

Restructure all four English tutorials to match their Chinese counterparts:
- Add "Why this approach is needed" sections explaining traditional limitations
- Add high-level mechanism sections before code
- Move compilation/execution sections after code analysis
- Add environment requirements tables
- Use consistent section ordering across all tutorials

* Regenerate TOC after tutorial title changes

Run generate_toc.py to sync SUMMARY and README files with
updated tutorial titles from the restructuring.

* Regenerate compatibility tables after title changes

---------

Co-authored-by: LinuxDev9002 <i@littlefisher.me>

src/compatibility.zh.md

@@ -57,6 +57,10 @@
 | [eBPF 教程：进程级能源监控与功耗分析](48-energy/README.zh.md) | 5.8 | 必需特性 | x86_64, arm64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_EVENTS=y, CONFIG_DEBUG_INFO_BTF=y, CONFIG_TRACEPOINTS=y | 无 | 需要 | CI 构建测试 |
 | [eBPF 教程：无需内核补丁修复故障的 HID 设备](49-hid/README.zh.md) | 6.3 | 教程文档 | x86_64, arm64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_DEBUG_INFO_BTF=y, CONFIG_HID_BPF=y, CONFIG_UHID=y\|m | 无 | 需要 | CI 构建测试 |
 | [eBPF 入门实践教程第五十篇：使用 TCX Link 实现可组合的流量控制](50-tcx/README.zh.md) | 6.6 | 教程文档 | x86_64, arm64 | 可选 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_NET_XGRESS=y | 网络接口 | 需要 | CI 构建测试 |
+| [eBPF 教程：精准隔离已建立的 TCP 连接](51-tcp-quarantine/README.zh.md) | 6.5 | 教程文档 | x86_64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_JIT=y, CONFIG_BPF_EVENTS=y, CONFIG_DEBUG_INFO_BTF=y, CONFIG_INET=y, CONFIG_PROC_FS=y | 无 | 需要 | CI 运行测试 |
+| [eBPF 教程：使用 fsession 追踪慢速 vfs_read 调用](52-fsession-latency/README.zh.md) | 7.0 | 教程文档 | x86_64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_JIT=y, CONFIG_BPF_EVENTS=y, CONFIG_DEBUG_INFO_BTF=y, CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y | 无 | 需要 | CI 构建测试 |
+| [eBPF 教程：用 BPF Qdisc 实现出口限速](53-egress-pacer/README.zh.md) | 6.16 | 教程文档 | x86_64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_JIT=y, CONFIG_DEBUG_INFO_BTF=y, CONFIG_NET_SCHED=y, CONFIG_NET_SCH_BPF=y | 网络接口 | 需要 | CI 构建测试 |
+| [eBPF 教程：检查 exec 后真正安装的可执行镜像](54-exec-image-inspector/README.zh.md) | 6.19 | 必需特性 | x86_64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_JIT=y, CONFIG_BPF_LSM=y, CONFIG_SECURITY=y, CONFIG_DEBUG_INFO_BTF=y | 无 | 需要 | CI 构建测试 |
 | [eBPF 实例教程：基于 cgroup 的策略控制](cgroup/README.zh.md) | 5.8 | 必需特性 | x86_64, arm64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_CGROUPS=y, CONFIG_CGROUP_BPF=y, CONFIG_CGROUP_DEVICE=y, CONFIG_DEBUG_INFO_BTF=y | 无 | 需要 | CI 构建测试 |
 | [eBPF 实例教程：BPF Arena 零拷贝共享内存](features/bpf_arena/README.zh.md) | 6.9 | 教程文档 | x86_64, arm64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_JIT=y, CONFIG_DEBUG_INFO_BTF=y | 无 | 需要 | CI 构建测试 |
 | [eBPF 教程：BPF 迭代器用于内核数据导出](features/bpf_iters/README.zh.md) | 5.8 | 教程文档 | x86_64, arm64 | 需要 | CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_DEBUG_INFO_BTF=y | 无 | 需要 | CI 构建测试 |