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 48.24%. Comparing base (ccbb8b4) to head (1a104f3).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   48.24%   48.24%           
=======================================
  Files           5        5           
  Lines         257      257           
=======================================
  Hits          124      124           
  Misses        133      133           

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