chore(github): add CODEOWNERS

[UnbornAztecKing]

Summary

• Introduces CODEOWNERS to standardize review ownership and auto-assign reviewers.
• Sets default ownership to @dydxprotocol/web-code-owners for all files.
• Assigns @dydxprotocol/security as owners for /.github/ and /CODEOWNERS to enforce security oversight on governance files.

Details

• Repo governance:
  • GitHub will auto-request reviews from code owners; with branch protection “Require review from Code Owners,” merges may require approvals from these teams.
• Path ownership:
  • "*" → @dydxprotocol/web-code-owners (default).
  • "/.github/" → @dydxprotocol/security (workflows, templates, policies).
  • "/CODEOWNERS" → @dydxprotocol/security (self-governance of ownership rules).

Risk & Impact

• Low risk: configuration-only; no runtime behavior changes.
• Potential reviewer routing changes; may block merges if branch protection requires code owner approvals.

Testing

• No tests applicable; config addition only.

Reviewer Notes

• Verify the teams exist and have correct permissions: @dydxprotocol/web-code-owners, @dydxprotocol/security.
• Confirm the intended scope of "/.github/" (includes all workflow and policy files).
• If required, ensure branch protection rules are configured to require code owner reviews.

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Project	Deployment	Actions	Updated (UTC)
v4-staging	Ready	Preview, Comment	Jan 31, 2026 0:51am
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