* feat(firecrawl): add keyless Firecrawl Search (Free) provider + richer firecrawl_search options
Add an opt-in, keyless 'firecrawl-free' web_search provider (Firecrawl
Search (Free)) mirroring the Parallel plugin's parallel-free pattern:
requiresCredential false, no autoDetectOrder, never auto-selected. The
free path is credential-isolated — it never resolves or sends any
Firecrawl API key (no Authorization header), so opting out of credentials
cannot leak a configured/paid key — and its results and cache key carry a
distinct 'firecrawl-free' provider identity. The keyed 'firecrawl'
provider and core search auto-select behavior are unchanged, honoring the
maintainers' opt-in policy for keyless search.
Registered in index.ts, the web-search-provider barrel, the
web-search-contract-api metadata artifact (the onboarding/setup source),
manifest contracts, the official external plugin catalog snapshot, and
the doctor/contract registries.
Also extend the firecrawl_search tool to /v2/search parity:
includeDomains/excludeDomains (mutually exclusive), tbs, location,
country, and raise the result cap to 100.
* docs: regenerate docs_map for firecrawl heading rename
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Co-authored-by: developersdigest <jonathan@sideguide.dev>
