docs(skills): testing.md Pattern 5 registers the text renderer it renders (objectui#9380, patch round 1)

Copied verbatim, the corrected fence still threw for a reader whose setup
registers nothing: `Unknown component type: text` on both tests. The fence now
carries the one side-effect import that registers the renderers, spelled the
way page-builder.md spells its plugin imports. Nothing else in the fence moves.

Measured on the current renderer (vitest `dom` project, light setup that
registers nothing): the fence byte-identical to the published one passes both
tests; the same file minus this import fails both with `Unknown component
type:` — the control. Scratch files deleted before commit.

Line readings: `testing.md` 364 -> 370 (+6); `skills/**/SKILL.md` + this guide
501 -> 507 (+6), exactly the PR budget.

Claude-Session: https://claude.ai/code/session_01EBx9rvB7dufCz4at53x35U
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

skills/objectui/guides/testing.md

@@ -134,6 +134,7 @@ Expression roots are the keys of the `scope` a host publishes through `Predicate
 import { describe, it, expect } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import { PredicateScopeProvider, SchemaRenderer } from '@object-ui/react';
+import '@object-ui/components';
 
 describe('SchemaRenderer', () => {
   const scope = {