feat(web-search): add Exa as a web search provider

[10ishq]

feat(web-search): add Exa as a web search provider

Adds Exa as a web search provider.

Changes

• Add "exa" to SEARCH_PROVIDERS
• runExaSearch with x-exa-integration: "openclaw" header for usage tracking
• Config resolvers: resolveExaConfig, resolveExaApiKey, resolveExaContents, resolveExaMaxChars
• Zod schema validation and TypeScript types for Exa config
• Auto-detection via EXA_API_KEY env var

Configuration

{
  tools: {
    web: {
      search: {
        provider: "exa",
        exa: {
          apiKey: "your-exa-api-key",
          contents: true,
          maxChars: 1500,
        },
      },
    },
  },
}

Exa options

Option	Description	Default
contents	Include page text in results	true
maxChars	Max characters per result	1500

[10ishq]

Hey @billgetman — would love your review on this. Adds Exa as a web search provider alongside the existing Brave, Perplexity, and Grok providers. Adapted to deepclaw's specific codebase.

Key changes in src/agents/tools/web-search.ts:

• runExaSearch with x-exa-integration: "openclaw" header
• Exa config resolvers (resolveExaApiKey, resolveExaContents, resolveExaMaxChars)
• Updated runWebSearch and createWebSearchTool to handle exa provider

Exa's neural search with category filters (company, research paper, news, etc.) should pair well with deepclaw's voice-focused workflow.