test(snapshots): refresh code/both-mode fixtures against the replay model pins

The re-records for the SDK-prompt change had harvested live v4-pro
headers while every replay overlay pins v4-flash, so keyless replay
diverged on provenance; keyless refresh reconciles the affected
scenarios (dispatch-start pairs preserved).

examples/tui-agent/tests/snapshots/code-mode/terminal.expected.txt

@@ -1,7 +1,7 @@
-terminal 100x36 buffer=normal length=66 base=30 viewport=30
+terminal 100x36 buffer=normal length=64 base=28 viewport=28
 lifecycle started=1 stopped=0 progress=inactive
 title "Using ONE run_code program: call — DSH TUI snapshot"
-cursor hidden column=1 viewportRow=31 bufferRow=61
+cursor hidden column=1 viewportRow=33 bufferRow=61
 buffer
 0| " DEEPSEEK HARNESS"
   style 1-8 fg=bright-blue bold
@@ -134,4 +134,3 @@ buffer
 63| "deepseek-v4-flash  /workspace/project  ↑182 ↓446  cache 98%  4% context  tools:c"
   style 0-78 dim
   style 81-99 dim
-64-65| <blank>