fix: remove 'q' alias from /quit so /queue's 'q' alias works (#10467) (#10538)

Both /queue and /quit registered 'q' as an alias. Since /quit appeared
later in COMMAND_REGISTRY, _build_command_lookup() silently overwrote
/queue's claim, making the documented /queue shorthand unusable.

Fix: remove 'q' from /quit's aliases. /quit already has 'exit' as an
alias plus the full '/quit' command. /queue has no other short alias.

Closes #10467

tests/hermes_cli/test_commands.py

@@ -97,7 +97,7 @@ class TestResolveCommand:
     def test_alias_resolves_to_canonical(self):
         assert resolve_command("bg").name == "background"
         assert resolve_command("reset").name == "new"
-        assert resolve_command("q").name == "quit"
+        assert resolve_command("q").name == "queue"
         assert resolve_command("exit").name == "quit"
         assert resolve_command("gateway").name == "platforms"
         assert resolve_command("set-home").name == "sethome"