Fix consecutive-hyphen Skill name validation

[Yong-yuan-X]

Summary

Closes #12

修复 Skill 名称静态检查遗漏连续连字符（--）的问题。
此前，pdf--processing 这样的名称能够通过检查，但 Agent Skills specification 明确规定 Skill 名称不能包含连续连字符。

What changed

• 更新 skills/skillhone/scripts/quality/static_check.py 中的名称正则表达式，拒绝包含 -- 的名称。
• 新增 .test/test_static_check_name.py 回归测试：
  • 验证 pdf--processing 会报告 invalid_name；
  • 验证合法名称 pdf-processing 仍然可以通过检查。
• 将该回归测试加入 GitHub Actions CI。

Reproduction

使用名称和目录均为 pdf--processing 的最小 Skill fixture 运行静态检查。

修复前：

• pdf--processing 没有产生 invalid_name；
• 静态检查以退出码 0 结束。

运行回归测试：

python .test/test_static_check_name.py

修复后，包含连续连字符的名称会被拒绝，单连字符名称仍然有效。

Validation and results

• Command: python .test/test_static_check_name.py

• Result: 2/2 passed

• Before → after: pdf--processing 从未报告错误变为报告 invalid_name

• Commands:

  python skills/skillhone/scripts/quality/static_check.py skills/skillhone
  python skills/skillhone/scripts/quality/static_check.py skills/skillhone-auto-optimization
  python skills/skillhone/scripts/quality/static_check.py skills/skillhone-benchmark-optimization

• Result: 3/3 Skill directories passed

• Command: git diff --check

• Result: passed

• Command: pnpm test

• Result: 受 Windows 环境差异影响，完整测试结果待维护者批准 GitHub Actions 后由 Ubuntu CI 进一步验证；本次修改相关的回归测试已 2/2 passed。

• Command: gitleaks dir . --no-banner --redact

• Result: current PR contents passed with 0 findings

• Command: gitleaks git . --no-banner --redact

• Result: 21 commits scanned, 0 findings

Effect and limits

现在包含连续连字符的 Skill 名称会被静态检查拒绝，校验行为与 Agent Skills specification 保持一致。

本次修改仅收紧名称格式校验，没有改变其他 frontmatter 规则；合法的单连字符名称继续通过检查。

Review checklist

• The linked Issue and reproduction are clear.
• Focused repository tests pass, with counts reported above.
• The diff contains only files needed for this fix.
• I ran git diff --check.
• I ran gitleaks or an equivalent credential scan.
• This change contains no API keys, private prompts, private traces, or generated local state.
• No generated repair was pushed or merged automatically.
• A user has reviewed the Issue, tests, commits, and changed files before merge.