docs: refresh gateway feature registry mirrors

docs/gateway/index.md

@@ -305,6 +305,8 @@ Defaults include isolated state/config and base gateway port `19001`.
 
 - First client frame must be `connect`.
 - Gateway returns `hello-ok` snapshot (`presence`, `health`, `stateVersion`, `uptimeMs`, limits/policy).
+- `hello-ok.features.methods` / `events` are a conservative discovery list, not
+  a generated dump of every callable helper route.
 - Requests: `req(method, params)` → `res(ok/payload|error)`.
 - Common events: `connect.challenge`, `agent`, `chat`, `presence`, `tick`, `health`, `heartbeat`, `shutdown`.
 

docs/gateway/protocol.md

@@ -218,6 +218,11 @@ This page is not a generated full dump, but the public WS surface is broader
 than the handshake/auth examples above. These are the main method families the
 Gateway exposes today.
 
+`hello-ok.features.methods` is a conservative discovery list built from
+`src/gateway/server-methods-list.ts` plus loaded plugin/channel method exports.
+Treat it as feature discovery, not as a generated dump of every callable helper
+implemented in `src/gateway/server-methods/*.ts`.
+
 ### System and identity
 
 - `gateway.identity.get` returns the gateway device identity used by relay and