chore: remove @Avtrkrb as a code owner - #1213

Removes @Avtrkrb as a code owner.

This is fixing a live defect, not tidying

GitHub's own CODEOWNERS validator currently reports on main:

Unknown owner on line 2: make sure @Avtrkrb exists and has write access
to the repository

That is fallout from moving the account to triage during the permissions pass. A code owner without write access cannot satisfy a code-owner review requirement, and Review gates sets require_code_owner_review: true. The replacement validates clean.

Individuals, not the team — and why

The other six repos in this batch move to @Nano-Collective/core-team. This one deliberately does not.

nc-review flagged the reason on the first version of this PR, correctly, as blocking:

stale-prs.yml parses CODEOWNERS for individual logins and explicitly skips team entries (those containing /). After this PR, the workflow finds zero owners, logs a warning, and returns — silently disabling stale-PR escalation on the main repo.

Verified against the file:

// Teams (containing a slash, e.g. @org/team) are skipped since we
// can't cheaply resolve team membership here.
if (tok.startsWith('@') && !tok.includes('/')) { owners.add(...) }
...
if (owners.size === 0) {
  core.warning('No codeowners parsed; nothing to escalate.');
  return;
}

nanocoder is the only repo in the org with a workflow that reads CODEOWNERS, which is why the other six are safe on the team.

The file now carries a comment explaining the coupling, so the next person to reach for the team knows what to fix first: teach stale-prs.yml to resolve team membership, or centralise it into Nano-Collective/.github per step 9.