chore: add Dependabot cooldown and update auto-merge to v0.5.0

[cuioss-oliver]

Summary

• Add tiered cooldown to dependabot.yml (patch: 1d, minor: 3d, major: 7d) as supply chain security measure
• Update auto-merge caller to v0.5.0 — now auto-merges all minor/patch updates (major requires manual review)

Test plan

• CI passes
• dependabot.yml is valid YAML with cooldown on all ecosystems
• Auto-merge workflow references correct SHA

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @cuioss-oliver, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the repository's dependency management strategy by implementing a tiered cooldown period for Dependabot updates, improving supply chain security. Concurrently, it streamlines the auto-merging process for minor and patch updates, ensuring efficient maintenance while retaining manual oversight for significant version changes.

Highlights

• Dependabot Cooldown: Introduced a tiered cooldown period for Dependabot updates in .github/dependabot.yml to enhance supply chain security. Patch updates will have a 1-day cooldown, minor updates 3 days, and major updates 7 days.
• Auto-merge Workflow Update: Updated the auto-merge caller to version v0.5.0, which now automatically merges all minor and patch dependency updates, while major updates still require manual review.

Changelog

• .github/dependabot.yml
  • Added cooldown configuration with default-days, semver-major-days, semver-minor-days, and semver-patch-days to control the delay before Dependabot updates are merged.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/dependabot-auto-merge.yml

Activity

• The pull request was generated using Claude Code, an AI tool.

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[gemini-code-assist]

Code Review

This pull request introduces a cooldown configuration for Dependabot to manage the frequency of update pull requests, which is a good practice for supply chain security. The implementation is sound, though I've offered a suggestion to make the configuration more concise by removing a redundant entry.