feat(github): toggle [WIP] and [Done] prefixes in issue titles

[github-actions]

Closes #559

Applied changes based on Issue #559.

I’ve updated runAction.ts so that the “createIssues” path also toggles the issue/PR title to [Done] before finalizing reactions—matching the documented behavior (prefix with [WIP] at start and switch to [Done] when complete). Specifically, I inserted the title‐update and completion log in the if (createIssues) { … } block.

Changes

// …inside runAction(…):
if (createIssues) {
  const { createIssuesFromFeaturePlan } = await import('./createIssues.js');
  await createIssuesFromFeaturePlan(
    octokit,
    repo,
    agentEvent.github,
    output,
    progressCommentId,
  );
+ await updateTitle('Done');
+ core.info('Action completed successfully.');
  await finalizeReactions();
  return;
}

【F:src/github/runAction.ts†L174-L185】

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Next Steps

• This ensures that whether you’re doing a full PR edit or creating follow‐on issues, the title toggles to [Done] when finished.
• I did not adjust any unrelated tests or modules; please let me know if you’d like to update the surrounding test suite or documentation further.