Add AGENTS symlink

[HTHou]

Summary

• Add AGENTS.md as a symbolic link to CLAUDE.md.
• Let Codex and other agents discover the existing repository guidance without duplicating its content.

Validation

• Ran git diff --cached --check before committing.
• Confirmed AGENTS.md is a symlink (mode 120000).

[sonarqubecloud]

Quality Gate failed

Failed conditions
5.4% Duplication on New Code (required ≤ 5%)

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.40%. Comparing base (402e399) to head (ff5de64).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17701      +/-   ##
============================================
+ Coverage     40.26%   40.40%   +0.13%     
  Complexity     2574     2574              
============================================
  Files          5179     5179              
  Lines        349659   349659              
  Branches      44688    44688              
============================================
+ Hits         140798   141283     +485     
+ Misses       208861   208376     -485     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.