The completion-safe long-tail path. Feeding whole library symbol sets into
the editor's candidate pool was measured to make ranking worse (U8g2 alone
injects ~250 module-level class names; ArduinoJson dozens of ARDUINOJSON_*
macros). What does help is answering `client.` once tree-sitter has resolved
`client` to a declared type the embedded catalog does not know -- and for
that the engine needs "the members of type T", not "the symbols of library
L". This endpoint returns exactly that: symbols whose owner is the requested
class, from whichever cached library declares it, in the same payload shape
as /symbols/ so the engine's RemoteSymbolCache stores it unchanged.
Resolution: a class-name -> cache-entry index built once over the library
cache (each per-entry scan is already disk-cached), persisted under
.symbols/_types.json (3,818 classes / 199 KB over the 1,125-entry
production cache; ~1 s to rebuild from cached scans, ~60 s cold), refreshed
after a few hours or when the cache grows. Many classes are declared by more
than one library -- the real one plus forks and bundles vendoring a copy
(PubSubClient inside "ESP8266 Microgear", NTPClient inside "ESP8266 Weather
Station", AccelStepper inside "Arduino Learning Board") -- so the pick is:
the library named after the class, else the one declaring the most members
of it (vendored copies are trimmed), else alphabetical.
Generic, not pro-specific: any host with a library cache can use it.
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