Review and simplify pass on the guest fast-search restore.
- tools/tool_backend_helpers.py: _account_info was split out so two gates
could share one account read. Only managed_nous_tools_enabled is left, so
fold it back into its pre-salvage shape. Keep the branched force_fresh
call, because tests stub the reader with zero-arg lambdas.
- plugins/web/perplexity/provider.py: the managed= parameter on
_managed_gateway only fed the removed refusal helper. search() now calls
resolve_free_search_gateway() directly once it has the route answer. The
module docstring now names guests.
- hermes_cli/nous_account.py: the _error_info docstring described the
removed gate. The tier carried on a failed lookup still picks the "needs
a Nous account" copy over billing or re-login guidance.
- Tests: the case-insensitive tier match and the tier on error snapshots
lost their only coverage when the gate tests went, so cover them at
their consumer, format_nous_portal_entitlement_message. The fast-search
premise now asserts that the guest case really reads as the anonymous
tier. Remove the dead exp_offset parameter.
- Docs: the Perplexity section said there is no anonymous tier, which is
true for direct keys only. It now names the managed guest route.
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