The MCP spec says a ping result is empty, but both ping formatters put
the OpenPencil discovery identity (server/mode/token) at the result top
level. Gemini CLI validates ping with the TS SDK's strict EmptyResultSchema
and marked the server disconnected with 'Unrecognized keys: server, mode,
token' (issue #199). _meta is the spec's sanctioned extension point and
the only key the strict schema permits, so the identity now rides there;
the op CLI reads _meta first and falls back to the legacy top-level shape
so it still discovers a running pre-0.8.3 editor. (A pre-0.8.3 op CLI
cannot discover a 0.8.3 live editor — the CLI ships with the app, so only
a stale op on PATH hits this.)
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