New page: tools/exa-search.md
- Neural/keyword/hybrid search modes with content extraction
- Tool parameters including contents (highlights, text, summary)
- Search mode reference table
Rewritten: tools/duckduckgo-search.md
- Aligned to consistent template (Setup, Config, Tool parameters, Notes, Related)
- Simplified from previous version
Aligned across all providers:
- Every search page now ends with a consistent ## Related section
- Replaced 'See [Web tools]' with proper Related links
- Added Exa + DuckDuckGo to web.md overview CardGroup and comparison table
- Added Exa to docs.json nav and redirects
Correct anchor is #env-vars-and-env-loading (matching the actual
heading '## Env vars and .env loading' in help/faq.md).
Fixed in: tools/web.md, tools/perplexity-search.md, perplexity.md
