The wrapper was using src.app.main:app which expects 'src' to be a top-level
module, but with PYTHONPATH set to apps/agent-coordinator/src, the correct
import target is app.main:app.
The wrapper was inserting /opt/aitbc/aitbc to sys.path, which is incorrect.
The aitbc package is at /opt/aitbc/aitbc/__init__.py, so the path should be
/opt/aitbc, not /opt/aitbc/aitbc.
The wrapper scripts were setting PYTHONPATH to only the app's src directory,
causing 'ModuleNotFoundError: No module named aitbc' when services tried
to import from the aitbc package. Added REPO_DIR to PYTHONPATH in
coordinator-api, agent-coordinator, and explorer wrappers to allow aitbc imports.
