think: expose turn call settings

[threepointone]

Summary

• Expose stable AI SDK streamText call settings on Think TurnConfig, including timeout and maxRetries.
• Forward those settings through Think's inference loop and merge JSON-safe values from extension beforeTurn hooks.
• Document the new per-turn settings and add regression coverage for provider-visible call settings.

Fixes #1446

Test plan

• npx vitest --run -c packages/think/src/tests/vitest.config.ts packages/think/src/tests/hooks.test.ts
• npm run build --workspace @cloudflare/think
• ReadLints on touched files

Made with Cursor

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[changeset-bot]

🦋 Changeset detected

Latest commit: 38f516d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudflare/think	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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

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commit: 38f516d