chore: raise Gemini review threshold

[apstndb]

Summary

• Add .gemini/config.yaml for Gemini Code Assist on GitHub.
• Set code_review.comment_severity_threshold to HIGH so low/medium severity review comments are suppressed.

Validation

• git diff --check
• ruby -e 'require "yaml"; abort unless YAML.load_file(".gemini/config.yaml").dig("code_review", "comment_severity_threshold") == "HIGH"'

Reference: https://developers.google.com/gemini-code-assist/docs/customize-repo-review

[gemini-code-assist]

Note

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

[Copilot]

Pull request overview

Adds repository-level configuration for Gemini Code Assist on GitHub to suppress low/medium severity review comments by setting the minimum comment severity to HIGH.

Changes:

• Add .gemini/config.yaml with code_review.comment_severity_threshold: HIGH.

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