Feature/delta team/epic r04 (#7)

## Summary

epic r04 - begin refactor

## Change Type

- [x] Cowork feature
- [ ] Bug fix
- [ ] Core AI contribution
- [ ] Test / hardening
- [ ] Performance
- [ ] Documentation

## Related Work

Cowork Task:

Core Repo: http://34.143.229.138/gitea-admin/fsg-ai-core-assets

Core AI Issue:

Core Task:

Related PR:

## Scope

What is intentionally included?

What is intentionally NOT included?

## Validation

- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual verification
- [ ] Regression check

Commands / evidence:

## Security Impact

Permission / credential / network / customer data impact:

## Compatibility

- [ ] No breaking change
- [ ] Breaking change documented

## Reviewer Notes

Anything Cowork reviewers should pay attention to.

---------

Co-authored-by: Anh Tran Nguyen Minh <anhtnm1@fpt.com>
Co-authored-by: Huong Le Thi Thien <huongltt35@fpt.com>
Co-authored-by: Nam Pham Dinh Thanh <nampdt@fpt.com>
Co-authored-by: Vu Dam Tuan <vudt15@fpt.com>
Co-authored-by: Hiep Ha Van <hiephv3@fpt.com>
Co-authored-by: Lam Hoang Van <lamhv7@fpt.com>
Reviewed-on: #7
Co-authored-by: Duy Le Huu <duylh19@fpt.com>

conftest.py

@@ -0,0 +1,32 @@
+"""Root pytest conftest — loaded before ``tests/conftest.py``.
+
+This checkout lives on disk as ``Refactor`` (not ``cowork_local``), while
+``tests/`` imports everything as ``from cowork_local... import ...`` and
+``tests/conftest.py`` makes that resolve by putting this repo's *parent*
+directory on ``sys.path`` (expecting the repo root itself to be named
+``cowork_local``). A sibling folder literally named ``cowork_local`` (an
+unrelated, older checkout) already exists next to this one, so without this
+file Python would silently import THAT folder instead of this repository
+whenever a test does ``import cowork_local``.
+
+Registering the alias here — before ``tests/conftest.py`` touches
+``sys.path`` — caches this repository in ``sys.modules['cowork_local']``
+first, so the later ``sys.path`` mutation has nothing left to do (imports
+are cached by name; the first successful import of a given name wins for
+the rest of the process).
+"""
+from __future__ import annotations
+
+import importlib.util
+import sys
+from pathlib import Path
+
+_ROOT = Path(__file__).resolve().parent
+
+if "cowork_local" not in sys.modules:
+    spec = importlib.util.spec_from_file_location(
+        "cowork_local", _ROOT / "__init__.py", submodule_search_locations=[str(_ROOT)],
+    )
+    module = importlib.util.module_from_spec(spec)
+    sys.modules["cowork_local"] = module
+    spec.loader.exec_module(module)