Fix docs AGENTS standards link

[GreenFlux]

Context

docs/AGENTS.md should resolve to the repository standards document instead of exposing a plain filename to tools that read it. This change adds it as a relative symlink to the root standards file.

How did you test your changes?

• Confirmed docs/AGENTS.md resolves to the standards document content.
• Confirmed docs/AGENTS.md is a symlink and points to ../CLAUDE.md.

Types of changes

• Breaking change (a fix or a feature because of which an existing functionality doesn't work as expected anymore)
• New feature or improvement (a non-breaking change that adds functionality)
• Bug fix (a non-breaking change that fixes an issue)
• Additional language file, or a change to an existing language file (translations)
• Change to the documentation

Related issues:

1. Fixes #...

Checklist:

• I have reviewed the guidelines about Contributing to HyperFormula and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement.
• My change is compliant with the OpenDocument standard.
• My change is compatible with Microsoft Excel.
• My change is compatible with Google Sheets.
• I described my changes in the CHANGELOG.md file.
• My changes require a documentation update.
• My changes require a migration guide.

  

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.16%. Comparing base (68ae691) to head (3c05cdb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1690   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files         175      175           
  Lines       15319    15319           
  Branches     3356     3356           
=======================================
  Hits        14884    14884           
  Misses        427      427           
  Partials        8        8           

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[github-actions]

Performance comparison of head (3c05cdb) vs base (68ae691)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 507.68 | 493.33 | -2.83%
                                      Sheet B | 164.63 | 159.78 | -2.95%
                                      Sheet T | 148.15 | 143.77 | -2.96%
                                Column ranges | 463.15 | 477.44 | +3.09%
Sheet A:  change value, add/remove row/column |  14.76 |  14.58 | -1.22%
 Sheet B: change value, add/remove row/column | 127.04 | 122.37 | -3.68%
                   Column ranges - add column | 140.45 | 141.63 | +0.84%
                Column ranges - without batch | 437.67 | 428.41 | -2.12%
                        Column ranges - batch | 110.15 | 111.01 | +0.78%