Rename CLAUDE.md to AGENTS.md

[ethlo]

The cross-tool name for the same file. Content unchanged apart from the heading and the first line, which no longer name one tool.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.37%. Comparing base (88a5d6a) to head (edfd5c6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #65   +/-   ##
=========================================
  Coverage     88.37%   88.37%           
  Complexity      786      786           
=========================================
  Files            38       38           
  Lines          1660     1660           
  Branches        330      330           
=========================================
  Hits           1467     1467           
  Misses          123      123           
  Partials         70       70           

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