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>

application/workspaces/__init__.py

@@ -0,0 +1,17 @@
+"""Workspace file operations for non-agent-loop callers (EPIC R06, R08)."""
+
+from .ai_edit_output import parse_ai_output, split_code_block
+from .file_preview_helpers import is_probably_text, pptx_available, read_text
+from .file_workspace_service import FileWorkspaceService
+from .graph_index_service import extract_file_contents, pdf_to_markdown
+
+__all__ = [
+    "FileWorkspaceService",
+    "read_text",
+    "is_probably_text",
+    "pptx_available",
+    "split_code_block",
+    "parse_ai_output",
+    "pdf_to_markdown",
+    "extract_file_contents",
+]