The free managed Perplexity fast-search route exists for anonymous guest
Portal users. The salvage of #130121 (cee3000c24, via #130660) added a
registered-account gate, fast_search_entitled(), that excluded the
anonymous tier. That defeated the original change: guests fell back to
the keyless ring and never sent a gateway request.
This removes the gate, so resolve_free_search_gateway() decides on
identity alone again, as rewbs wrote it. The guest-disabled, expiry
refresh and dead-guest rules still apply through the token reader. Every
other vendor, and the billed managed-Firecrawl fallback, keep the paid
entitlement gate.
Kept from the salvage: the case-insensitive is_anonymous_tier, the
account tier carried on error snapshots, and the single route walk per
search dispatch. Tests: the anonymous identity is back in the autodetect
and rescue cases. The tests that pinned the guest exclusion are removed.
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