Add Alibaba Java coding guidelines skill

[ns3154]

Summary

• Add an Agent Skill for applying Alibaba Java Coding Guidelines to Java, Spring, MyBatis, Maven, MySQL, SQL, logging, exception handling, and security reviews.
• Include an English operational summary and a detailed rule reference for portable agent use.

Validation

• Ran node scripts/validate-skills.mjs: PASSED.
• Ran skills-security-scan for alibaba-java-coding-guidelines-skill: generated report status PASS with no findings. The repository script currently exits after report generation due to an unrelated trailing sks reference, but the generated report is clean.

Source project: https://github.com/ns3154/alibaba-java-coding-guidelines-skill

[github-actions]

✅ Validate Skills — PASSED

Summary: FAIL=0 · WARN=0
Changed skill dirs: alibaba-java-coding-guidelines-skill

Output (last 200 lines)

✅ Found 8 skill directories.
✅ alibaba-java-coding-guidelines-skill: structure validated
✅ api-setup: structure validated
✅ beads: structure validated
✅ code-review: structure validated
✅ frontend-design: structure validated
✅ goose-blog-post: structure validated
✅ rp-why: structure validated
✅ testing-strategy: structure validated

Structure validation PASSED.

[github-actions]

🛡️ Skills Security Scan — PASS

Summary: FAIL=0 · WARN=0 · FILES=2
Changed skills scanned: alibaba-java-coding-guidelines-skill

✅ No issues detected.

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Notes: This comment auto-updates on each push to keep PRs clean.