Use real Workers resources in browser tools tests

[mattzcarey]

Summary

• replace the Think browser-tools test's fake DurableObjectState/Fetcher/WorkerLoader with real Workers-pool resources
• add a test-only Durable Object host so createBrowserTools runs with real DO ctx, ctx.exports, facets, and env.LOADER
• add a test-only loopback WorkerEntrypoint to stand in for a Browser Run binding without raw object mocks

Validation

• pnpm --filter @cloudflare/think exec vitest --run -c src/tests/vitest.config.ts src/tests/browser-tools.test.ts
• pnpm exec nx run @cloudflare/think:test
• pnpm --filter @cloudflare/think exec tsc --noEmit

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Latest commit: 715a50c

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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commit: 715a50c