fix: disable noisy gemini summary

[trygveu]

Sets pull_request_opened.summary to false in .gemini/config.yaml, matching other repos (e.g. cognitedata/terraform#17602).

Made with Cursor

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.25%. Comparing base (c50988a) to head (e948ad1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #515   +/-   ##
=======================================
  Coverage   81.25%   81.25%           
=======================================
  Files          43       43           
  Lines        4210     4210           
=======================================
  Hits         3421     3421           
  Misses        789      789           

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[trygveu]

Risk review ok