- GoogleDorkSource uses Google Custom Search JSON API (APIKey+CX required)
- BingDorkSource uses Bing Web Search API v7 (Ocp-Apim-Subscription-Key header)
- formatQuery now handles google/bing/duckduckgo/yandex/brave dork syntax
- Both sources follow established pattern: retry via Client, rate limit via LimiterRegistry
- BuildQueries(reg, source) dedups keywords and formats per-source syntax
- github/gist use 'keyword' in:file; others use bare keyword
- SourcesConfig placeholder struct for Wave 2 plans to depend on
- RegisterAll no-op stub (Plan 10-09 will fill)