test(viewer): the fake agent waits a whole second (macOS's bash 3.2 takes no fraction)

The portable macOS job: `read -t 0.1` is "invalid timeout
specification" in /bin/bash 3.2, so the fake agent never said ready.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

crates/ledger-gui/tests/dock.rs

@@ -105,8 +105,10 @@ echo "fake-agent in $(basename "$(pwd)")"
 trap 'echo got-interrupt' INT
 trap 'echo "size $(stty size)"' WINCH
 echo ready
+# A whole second: macOS's /bin/bash is 3.2, whose `read -t` takes no
+# fraction (the portable job found it).
 while true; do
-  if read -r -t 0.1 line; then echo "you-said: $line"; fi
+  if read -r -t 1 line; then echo "you-said: $line"; fi
 done
 "#,
     )