Exclude copilot and GitHub Actions bots from ai-moderator review

[Copilot]

The ai-moderator workflow was processing issues and pull requests created by system bots (github-actions, copilot), wasting compute and potentially adding incorrect labels to automated content.

Changes

• Added copilot[bot] to bot exclusion list in ai-moderator workflow's check_external_user job
• Refactored bot checking from inline conditionals to maintainable array-based lookup
• Updated compiled workflow lockfile

Implementation

Before:

if (actor.endsWith('[bot]') && (actor === 'github-actions[bot]' || actor === 'github-actions')) {
  // Skip
}

After:

const excludedBots = ['github-actions[bot]', 'github-actions', 'copilot[bot]'];
if (actor.endsWith('[bot]') && excludedBots.includes(actor)) {
  core.info(`⏭️  Skipping workflow - issue opened by bot: ${actor}`);
  core.setOutput('should_run', 'false');
  return;
}

The workflow now correctly skips moderation for all system bot accounts.

Original prompt

ai-moderator should not review issue/pull requests created by the copilot or GitHub action bots.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.