feat(registry): add Airweave tool to registry with search capabilities

[EwanTauran]

Background

Airweave is an open-source platform that makes any app searchable for AI agents. We've created a Vercel AI SDK tool that enables unified semantic search across 35+ data sources (Notion, Slack, Google Drive, databases, and more).

Summary

Added Airweave to the tools registry with:

• Tool entry in content/tools-registry/registry.ts
• Package: @airweave/vercel-ai-sdk (published to npm)
• Tags: search, rag, data-sources, semantic-search

Manual Verification

1. Published @airweave/vercel-ai-sdk to npm
2. Tested the tool with generateText, streamText, and direct execution
3. Verified the tool correctly calls the Airweave API and returns search results

npm install @airweave/vercel-ai-sdk
AIRWEAVE_API_KEY=xxx OPENAI_API_KEY=xxx npx tsx tests/e2e.ts
# ✅ All tests passed

Checklist

• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• I have reviewed this pull request (self-review)

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Note: This is a tools registry addition only, no changes to AI SDK core packages, so changeset is not required.