Add GitHub Actions workflow for pull request checks

[Copilot]

Adds automated CI checks on pull requests to prevent broken builds and enforce code quality standards.

Workflow Jobs

• lint - Ruff format and lint checks on Python 3.10
• test - Pytest across Python 3.10, 3.11, 3.12 matrix
• build - Package build verification with artifact upload

Implementation

• Uses uv package manager with dependency caching
• Explicit permissions: contents: read for GITHUB_TOKEN scope limiting
• Triggers on PRs to main branch

on:
  pull_request:
    branches: [ main ]

permissions:
  contents: read

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add pytest & build github actions workflow for pull request</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add pytest & build github actions workflow for pull request #5

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