chore: add engineering standards (dependabot)

[nikzen]

Automated rollout from engineering-standards.

Base (always included):

• .github/dependabot.yml – automated dependency updates (Dependabot)
• Ecosystems: github-actions, rust docker
• Grouped PRs: major updates separate from minor+patch
• Cooldown: 14 days

Detected scope: rust docker

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (0105831) to head (b8198a1).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #208   +/-   ##
=======================================
  Coverage   90.17%   90.17%           
=======================================
  Files           9        9           
  Lines         529      529           
=======================================
  Hits          477      477           
  Misses         52       52           

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