Extends #3 by converting the header update script into a CI check that validates all Python files have the standard FMPose3D header with Apache 2.0 license.

Changes

• Enhanced scripts/update_headers.py:

  • Added --check mode for non-destructive validation
  • Now adds headers to files without them (previously only replaced old headers)
  • Handles from __future__ imports and shebangs correctly
  • Flexible matching allows files with additional documentation blocks

• New GitHub Action (.github/workflows/check-headers.yml):

  • Runs on all pushes and PRs to main
  • Fails CI if headers are missing or incorrect
  • Minimal permissions (contents: read)

• Applied headers to 56 Python files throughout the repository

Usage

# Check headers (CI mode)
python scripts/update_headers.py --check

# Fix headers locally
python scripts/update_headers.py

The action ensures all future contributions maintain consistent licensing attribution and project branding.

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