fix: simplify verification strings to handle non determinism in response

Signed-off-by: Casper Nielsen <casper@diagrid.io>

Author: CasperGN

examples/langgraph-checkpointer/README.md

@@ -35,25 +35,13 @@ Run the following command in a terminal/command prompt:
 name: Run subscriber
 expected_stdout_lines:
   - '== APP == Add 3 and 4.'
-  - '== APP == Tool Calls:'
-  - '== APP ==   add'
-  - '== APP ==  Call'
   - '== APP ==     a: 3'
   - '== APP ==     b: 4'
-  - '== APP == Name: add'
   - '== APP == 7'
-  - '== APP == The result of adding 3 and 4 is 7.'
-  - '== APP == Multiply the result by 2.'
   - '== APP ==   Args:'
   - '== APP ==     a: 7'
   - '== APP ==     b: 2'
-  - '== APP == ================================= Tool Message ================================='
-  - '== APP == Name: multiply'
-  - '== APP == '
   - '== APP == 14'
-  - '== APP == ================================== Ai Message =================================='
-  - '== APP == '
-  - '== APP == The result of multiplying 7 by 2 is 14.'
     
 output_match_mode: substring
 background: true