Added slash command handling

docs/13-testing.md

@@ -37,6 +37,10 @@ without the app (critical for verifying frame shapes early).
     carry the new `thread_id`; no-op with an existing `thread_id`, for slash
     commands, or for media-only sends; the LLM upgrade renames the thread
     (`channel.renamed`).
+- **Slash catalog:** `commands.catalog` request → response with the
+    gateway-available `COMMAND_REGISTRY` subset + plugin commands (each entry
+    `name`/`description`/`args_hint`/`category`/`aliases`); `cli_only` commands
+    excluded; response `id` matches the request `id`.
 - **No `~/.hermes` writes in tests** — use the `_isolate_hermes_home` fixture
   pattern (temp `HERMES_HOME`). Profile tests also mock `Path.home()`.
 
@@ -122,6 +126,11 @@ adb logcat -d > /tmp/logcat.txt
     flat lane → a new topic appears (derived name), the app jumps into it, the
     reply streams there, and the topic is renamed to the AI's title a moment
     later. Slash commands / media-only sends stay in the flat lane.
+14. **Slash drawer:** type `/` in the composer → the drawer rolls up over the
+    input with the gateway catalog; keep typing → fuzzy filtering (unrelated
+    entries drop out); tap a row → the command is sent and the drawer closes;
+    type an unknown command → the drawer closes (the raw text can still be
+    sent; hermes answers with its unknown-command reply).
 
 ## 13.5 Debugging tips