fix: Use long-running fixture for pause/resume test

The previous pause/resume test used simple.c which completes too fast to
pause reliably. Changed to use attach_target.c which runs for 30 seconds,
giving plenty of time to test the pause functionality.

Also modified the test to use "stop" command at the end instead of waiting
for the program to exit, to avoid waiting 30 seconds for the test to complete.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Alexander Kiselev

tests/scenarios/pause_resume_c.yml

@@ -1,49 +1,51 @@
 # Pause/Resume Test (C)
 # Tests pause command to stop running program
-# Uses factorial breakpoint to ensure program runs long enough for reliable pause
+# Uses attach_target fixture which runs long enough to reliably pause
 
 name: "C Pause/Resume Test"
 description: "Verifies pause command stops a running program"
 
 setup:
-  - shell: "gcc -g tests/fixtures/simple.c -o tests/fixtures/test_simple_c"
+  - shell: "gcc -g tests/fixtures/attach_target.c -o tests/fixtures/test_attach_target"
 
 target:
-  program: "../fixtures/test_simple_c"
+  program: "../fixtures/test_attach_target"
   args: []
   stop_on_entry: true
 
 steps:
-  # Set breakpoint in factorial to ensure we can pause during computation
+  # Set breakpoint in main loop to verify we can reach that code
   - action: command
-    command: "break factorial"
+    command: "break main"
     expect:
       success: true
 
   - action: command
     command: "continue"
 
-  # Wait for first factorial hit
+  # Wait for breakpoint in main
   - action: await
     timeout: 10
     expect:
       reason: "breakpoint"
 
-  # Remove breakpoint and continue - program will run through factorial(5)
+  # Remove all breakpoints and continue - program will start its 30-second loop
   - action: command
-    command: "breakpoint remove --all"
+    command: "breakpoint remove all"
+    expect:
+      success: true
 
   - action: command
     command: "continue"
 
-  # Immediately pause - factorial recursion should still be running
+  # Pause the running program
   - action: command
     command: "pause"
     expect:
       success: true
 
   - action: await
-    timeout: 5
+    timeout: 10
     expect:
       reason: "pause"
 
@@ -53,10 +55,8 @@ steps:
     expect:
       success: true
 
+  # Stop the debug session (don't wait for 30-second program to complete)
   - action: command
-    command: "continue"
-
-  - action: await
-    timeout: 10
+    command: "stop"
     expect:
-      reason: "exited"
+      success: true