Adds the setGenerator("core-ui-component") block, coreUiComponentActions
helper (2 guards + 4 add + 1 modify + 1 print = 8 actions), and
printCoreUiComponentNextSteps to config.ts; covers all three paths with
3 new unit tests in config.test.ts (registration shape, action shape per
tier, PascalCase validator). Generator test count: 17 → 20.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>