Add automated SPDX license header fixer and CI workflow

[abdelkadermeflahi6-web]

Motivation

• Ensure repository files include a consistent SPDX license header and automate adding any missing headers.
• Provide a CI workflow to run the header fixer on pushes to main and on pull requests so fixes can be proposed automatically.

Description

• Add fix_license_headers.py, a CLI script that scans a target path and inserts a configurable SPDX-License-Identifier: MIT header for supported file types.
• The fixer supports multiple comment styles (e.g. .py, .js, .ts, .sol, .aiken, .hs, .yaml) and skips common vendor/build directories such as .git, node_modules, dist, and __pycache__.
• The script preserves shebang lines when present and ensures a blank line separates the header from the file body when appropriate.
• Add a GitHub Actions workflow .github/workflows/check-fix-license-headers.yml that runs the fixer in CI and opens an automated pull request with the changes using peter-evans/create-pull-request.

Testing

• Ran python fix_license_headers.py --help to verify the CLI usage output and it succeeded.
• Executed a functional test by creating a temporary sample.py, running python fix_license_headers.py <tmpdir>, and verifying the SPDX-License-Identifier: MIT header was inserted; the test succeeded.

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Codex Task

[chatgpt-codex-connector]

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