Inline assets to fix GitHub Pages layout

[G-Fourteen]

Summary

• add a build helper that inlines CSS and JavaScript into the GitHub Pages artifact
• mark the HTML with build directives and update the workflow to call the helper
• document the inline build step in the README so the deployment pipeline is clear

Testing

• python tests/run_tests.py

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https://chatgpt.com/codex/tasks/task_b_6905542ab71083299829633485c8da8d