huskies: merge 1213 story Chat "stop" command that immediately aborts the in-flight LLM turn

server/src/chat/commands/mod.rs

@@ -229,6 +229,11 @@ pub fn commands() -> &'static [BotCommand] {
             description: "Distill the session transcript into a seed, then reset (unlike `reset`, keeps distilled context for the next message)",
             handler: handle_compact_fallback,
         },
+        BotCommand {
+            name: "stop",
+            description: "Cancel the in-flight LLM turn for this room (synonyms: `halt`, `abort`)",
+            handler: handle_stop_fallback,
+        },
         BotCommand {
             name: "timer",
             description: "Schedule a deferred agent start: `timer <story_id> <HH:MM>`, `timer list`, `timer cancel <story_id>`",
@@ -439,6 +444,16 @@ fn handle_compact_fallback(_ctx: &CommandContext) -> Option<String> {
     None
 }
 
+/// Fallback handler for the `stop` command when it is not intercepted by the
+/// async handler in `on_room_message`.  In practice this is never called —
+/// stop is detected and handled before `try_handle_command` is invoked.
+/// The entry exists in the registry only so `help` lists it.
+///
+/// Returns `None` to prevent the LLM from receiving "stop" as a prompt.
+fn handle_stop_fallback(_ctx: &CommandContext) -> Option<String> {
+    None
+}
+
 /// Fallback handler for the `cleanup_worktrees` command when it is not
 /// intercepted by the async handler in `on_room_message`.  In practice this is
 /// never called — cleanup_worktrees is detected and handled before