Fixed Missing __init__.py in file_system_toolkits package directory #6055

[tmlganesh]

Description

Adds missing init.py file to file_system_toolkits directory to ensure proper Python module resolution.

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Related Issues

Fixes #6055 )

Changes Made

• Added init.py to file_system_toolkits for package consistency
• File contains a minimal docstring matching the convention used in sibling directories

Testing

Describe the tests you ran to verify your changes:

• Unit tests pass (cd core && pytest tests/)
• Lint passes (cd core && ruff check .)
• Manual testing performed

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

Screenshots (if applicable)

N/A

[github-actions]

PR Requirements Warning

This PR does not meet the contribution requirements.
If the issue is not fixed within ~24 hours, it may be automatically closed.

PR Author: @tmlganesh
Found issues: #6055 (assignees: none)
Problem: The PR author must be assigned to the linked issue.

To fix:

1. Assign yourself (@tmlganesh) to one of the linked issues
2. Re-open this PR

Exception: To bypass this requirement, you can:

• Add the micro-fix label or include micro-fix in your PR title for trivial fixes
• Add the documentation label or include doc/docs in your PR title for documentation changes

Micro-fix requirements (must meet ALL):

Qualifies	Disqualifies
< 20 lines changed	Any functional bug fix
Typos & Documentation & Linting	Refactoring for "clean code"
No logic/API/DB changes	New features (even tiny ones)

Why is this required? See #472 for details.