Added slash command handling

docs/04-wire-protocol.md

@@ -150,18 +150,22 @@ request. The app uses this to **populate the initial view** when a channel is
 opened (complements `sync`, which only replays undelivered outbox frames).
 
 ### `commands.catalog`
-Response to a `commands.catalog` request. Full slash-command list.
+Request (app → server, empty payload) and response: the gateway's
+slash-command catalog for the app's `/` drawer. Derived from hermes' central
+`COMMAND_REGISTRY` (the same source the gateway help and the Telegram command
+menu use), restricted to commands available on gateway surfaces, plus
+plugin-registered commands. The app fuzzy-matches the typed prefix
+client-side (no `commands.complete` round-trip).
 ```json
 {"type":"commands.catalog","id":21,"payload":{
    "commands":[
-     {"name":"/new","description":"Start a new session","args_hint":"","category":"session"},
-     {"name":"/model","description":"Switch model","args_hint":"<provider/model>","category":"config"},
-     {"name":"/reasoning","description":"Toggle reasoning effort","args_hint":"[low|medium|high]","category":"config"},
-     {"name":"/status","description":"Show session status","args_hint":"","category":"info"},
-     {"name":"/cron","description":"Manage cron jobs","args_hint":"<list|add|rm>","category":"automation"},
-     {"name":"/tools","description":"List available tools","args_hint":"","category":"info"}
+     {"name":"/new","description":"Start a new session (fresh session ID + history)","args_hint":"[name]","category":"Session","aliases":["/reset"]},
+     {"name":"/model","description":"Switch model","args_hint":"<provider/model>","category":"Configuration","aliases":[]},
+     {"name":"/status","description":"Show session status","args_hint":"","category":"Info","aliases":[]}
    ]}}
 ```
+`name`/`aliases` carry the leading slash; `args_hint` is the registry's
+argument placeholder (empty when the command takes none).
 
 ### `commands.complete`
 Response to a `commands.complete` request. Autocomplete matches for a typed prefix.