fix: correct code-accuracy issues and doc hygiene in /extend/component/ (PRDCT-364) - #393

The pr-reviewer GitHub App is installed on this repo, but the machine user it posts reviews as (keboola-pr-reviewer-bot) doesn't have Write access here.

To enable reviews on this repo:

1. Add the bot user (or a team that contains it) as a Write collaborator in Settings → Collaborators and teams.
2. If the bot's fine-grained PAT uses an explicit repo allowlist, ask the operator (SRE) to add this repo to it — or to flip the PAT to All repositories so team membership alone is sufficient.

See docs/MACHINE_USER_SETUP.md for the full setup runbook.

The verdict (needs_human, risk 2) was computed but not posted because the user PAT got 403 Forbidden on POST /reviews.