feat(slark-dsh-cicd): 新增 DSH/Slark 发布实战技能（REQ-20261007-0003）

- 新建 skills-dev/slark-dsh-cicd-plugin：plugin.json + skills/SKILL.md +
  skills/references/fork-release-and-post-checks.md
- 覆盖两条发布线（DSH 插件 pack 双资产 / Slark 宿主重打包+签名）、权限与身份三连
  （push:true 才可写，ls-remote 通 ≠ 能 push）、无上游写权限的 fork 发布且原仓库零改动、
  干净单提交 + git diff --stat <OURS> 树一致性 gate、改指向后必须重新 pack、
  draft→publish 与「更新检查看不到新版」的因果、GitHub HTTPS/fetch 卡死/无 macOS timeout
  的判死处置、发布后 SHA 逐项核对（verify-remote 仅 Windows）、app.asar 完整性约束、
  ai-proj staging→released 与 /req done 证据要求及文档接口故障绕过
- 与 slark-cicd 明确分工并交叉引用，不重复 staging/生产/Desktop 细节
- update-plugin-meta.py PLUGIN_MAP 增加 slark-dsh-cicd-plugin (skill/dev)
- generate-marketplace.py devops 分类补充 slark-dsh-cicd；marketplace.json 仅新增该条目
- 校验：claude plugin validate . 通过（警告为该仓库既有 install_name 字段提示）、git diff --check 干净

update-plugin-meta.py

@@ -49,6 +49,7 @@ PLUGIN_MAP = {
     "karpathy-guidelines-plugin": ("karpathy-guidelines",         "skill",   "dev"),
     "pull-request-plugin":      ("pull-request",                  "skill",   "dev"),
     "review-checklist-plugin":  ("review-checklist",              "skill",   "dev"),
+    "slark-dsh-cicd-plugin":    ("slark-dsh-cicd",                "skill",   "dev"),
 
     # skills-integration
     "data-excel-plugin":        ("data-excel",                    "skill",   "integration"),