fix: correct binary path resolution in mpe_runner

Fix the project root path calculation in _resolve_mpe_binary().
The function was using parents[1] which only went up one level from
tests/utils/mpe_runner.py to tests/, but it needs parents[2] to reach
the actual project root where target/mpe is located.

This fixes the FileNotFoundError in CI where tests couldn't find the
mpe binary.

Tested: All 110 integration tests pass locally.
Signed-off-by: Yusuf Nathani <yusuf.nathani@sysvine.com>

Author: yan-vine

tests/utils/mpe_runner.py

@@ -7,7 +7,8 @@
 
 
 def _resolve_mpe_binary():
-    project_root = Path(__file__).resolve().parents[1]
+    # Go up 2 levels: tests/utils/mpe_runner.py -> tests/ -> project_root
+    project_root = Path(__file__).resolve().parents[2]
     local_binary = project_root / "target" / "mpe"
 
     if local_binary.exists():