refresh code-mode trajectory ordinals for the todo fixture turn

Turn 65 (todo_write) at the fx-alpha tail slides the 50-message history
window: two head-of-window messages drop out, so every trajectory cell
ordinal shifts down by two. Timing, labels, and cell content are unchanged.

apps/web/tests/code-mode-fixture.snapshot.ts

@@ -213,9 +213,9 @@ it('trajectory and waterfall surface the run_code sub-calls with real timing', a
   }).toMatchInlineSnapshot(`
     {
       "subCells": [
-        "#53Subbash · {"command":"ls notes","description":"List notes"}+0.8s",
-        "#54Subread · {"path":"notes/demo.txt"}+0.8s",
-        "#55Subread · {"path":"notes/missing.txt"}+0.8s",
+        "#51Subbash · {"command":"ls notes","description":"List notes"}+0.8s",
+        "#52Subread · {"path":"notes/demo.txt"}+0.8s",
+        "#53Subread · {"path":"notes/missing.txt"}+0.8s",
       ],
     }
   `)