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>

tests/routing/conftest.py

@@ -1,17 +1,9 @@
 """Pytest fixtures/shared helpers for the routing test suite.
 
-Ensures the ``cowork_local`` package is importable when pytest is invoked from
-the package directory itself (so ``import cowork_local.core.routing...`` works
-regardless of the working directory the suite is launched from).
+Package importability is handled once and for all by ``tests/conftest.py``,
+which binds THIS checkout to the ``cowork_local`` name in ``sys.modules``.
+This file used to push the checkout's PARENT directory onto ``sys.path``, which
+let an unrelated sibling folder named ``cowork_local`` shadow the working copy —
+so that logic is intentionally gone; keep it that way.
 """
 from __future__ import annotations
-
-import sys
-from pathlib import Path
-
-# .../cowork_local/tests/routing/conftest.py  →  parent of the package dir
-_PKG_DIR = Path(__file__).resolve().parents[2]      # .../cowork_local
-_REPO_ROOT = _PKG_DIR.parent                          # .../cowork_local_20260722
-for p in (str(_REPO_ROOT), str(_PKG_DIR)):
-    if p not in sys.path:
-        sys.path.insert(0, p)