Salvaged from #78434 by @Slobaka (also the issue reporter; earlier than
the competing #78436). hermes doctor no longer paints a green web check
when the explicitly selected provider cannot initialize — web splits
into per-capability rows (web search / web extract) resolved through
the same registry resolvers the dispatchers use, with readiness from a
true availability probe (_provider_is_ready).
Keyless-tier integration on top of the salvage:
- _provider_is_ready counts is_keyless_available() as ready — keyless
mode is a working state, not a misconfiguration (zero-config installs
and selected-keyless Tavily/Firecrawl show ok, not warn)
- Tavily/Firecrawl gain is_keyless_available() (True only when
explicitly selected — they stay out of the zero-config fallback)
- doctor triggers plugin discovery before reading the registry (fresh
doctor processes saw an empty registry and warned on everything)
E2E: searxng-selected-without-URL warns (the #78412 repro);
zero-config, tavily-keyless, firecrawl-keyless all read ok;
parallel pinned paid without a key warns.
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