chore: add second code owner

[nastyabon8]

Summary

Adds @nastyabon8 as a code owner alongside @Baskervlle42 for all repositories paths. This allows either maintainer to provide the required independent code-owner review.

Change type

• Bug fix
• Feature
• Documentation
• Refactor with no intended behavior change
• Dependency or build tooling
• Security hardening

Public API and compatibility

• The change is backward-compatible with the documented beta API.
• User-visible behavior is documented and listed in CHANGELOG.md.
• A migration note or ADR is included when the compatibility impact is material.

Security review

• I reviewed THREAT_MODEL.md and preserved its security invariants.
• The change introduces no implicit network, filesystem, environment, logging, or background-task behavior.
• Errors, warnings, fixtures, and snapshots contain no production secrets or real device data.
• New or changed untrusted-input paths have negative and resource-limit tests.
• New dependencies are justified below and do not require an unreviewed install script.

Dependency justification

Verification

• npm run verify -- not run locally because this PR changes only .github/CODEOWNERS; required CI checks will verify the repository.
• Relevant examples compile and use the current API. Not applicable: no examples or AP code changed.
• Tests use only disposable synthetic identities and sanitized fixtures. Not applicable: no examples or AP code changed.

Documentation and references

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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