Open the agent in a normal tiled window (#6769)

The floating rule pinned every agent terminal to 1200x800, which
overflows small and scaled displays: window rules see logical pixels, so
a 2560x1440 monitor at scale 1.6 is only 1600x900 and the window covered
89% of its height. Tiling drops the fixed size along with the rule, and
the shared app-id still earns the terminal tag from terminals.lua.

test/shell.d/default-agent-test.sh

@@ -316,7 +316,7 @@ assert_launched() {
   local description=$2
   shift 2
   # Every agent window launches under the same app-id, whichever agent is
-  # default, so default/hypr/apps/agent.lua can float them all.
+  # default, so window rules and themes see one class for all of them.
   local expected=(--app-id=org.omarchy.agent "$@")
 
   mapfile -d '' -t actual <"$launch_log"