[Task] Add GitHub Actions workflow for Python linting with Ruff

[rajeshuchil]

Problem statement

The repository currently contains only one GitHub Actions workflow
(sync-project-priority-from-labels.yml) which is project-management related.

There is no CI workflow for code quality validation such as linting,
syntax checking, or import validation on pull requests.

As a result, pull requests merge without any automated quality gate.
All style and static analysis issues must be identified manually during review,
which increases review burden and risk of regressions.

Proposed solution

Add a minimal GitHub Actions workflow that performs Python linting
using Ruff.

Scope:

• Add a workflow file in .github/workflows/
• Trigger on pull requests to main
• Install Python
• Install Ruff
• Run ruff check .
• Fail the workflow if lint errors are detected

This task is intentionally limited to linting only.
It does not introduce testing, packaging verification,
or a full CI/CD pipeline.

The goal is to establish a foundational automated quality gate
that can be extended in future work.

Acceptance criteria

• A new workflow file exists in .github/workflows/
• Workflow runs automatically on pull requests to main
• Ruff executes successfully
• Workflow fails if lint errors are introduced
• No runtime behavior of the application is changed

Dependencies and constraints

• No upstream dependency required
• Does not modify application logic
• Must comply with repository contribution workflow
• Future CI extensions (tests, packaging verification) are out of scope