tabularis-pr-review

Use when reviewing a Tabularis pull request locally — checking code quality against the repo's own rules, verifying the PR's claims, running its tests on the correct branch, and preparing real test data plus a manual test plan for the human. Use when the user says 'review PR #N', 'lass uns PR reviewen', 'check this PR', or wants to test a PR with real data before merging.