chore: set CODEOWNERS

[BigLep]

Setting CODEOWNERS as specified in https://app.notion.com/p/filecoindev/FOC-Engineering-Workstreams-342dc41950c1818f99d2e857a7f3cb2e

[BigLep]

@rvagg @LexLuthr: FYI that you are being made a CODEOWNER in this PR.

Note on CI: the failing check here is pre-existing and unrelated to this change. This PR only adds a .github/CODEOWNERS file, which cannot affect building, testing, linting, or link-checking. Specifically, every CircleCI job fails at the Checkout code step with git@github.com: Permission denied (publickey) / error running git clone ... exit status 128, i.e. CircleCI's deploy key can no longer read the repo.

[Copilot]

🟢 Ready to approve

The change is limited to a valid CODEOWNERS addition with no apparent syntax or structural issues.

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Pull request overview

Adds a repository-wide GitHub CODEOWNERS configuration so review/approval ownership is automatically applied across the codebase.

Changes:

• Introduces .github/CODEOWNERS with a catch-all rule (*) assigning ownership to @rvagg and @LexLuthr.
• Includes a brief comment and reference link describing the source of the ownership decision.

File summaries

File	Description
.github/CODEOWNERS	Adds default code owners for all paths in the repository.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[rvagg]

🤦 needs a migration to GHA, probably just the unified-ci workflows

this change is fine as is though