Group roles and improve resume presentation

[JayTeeBat]

Summary

• Group adjacent roles under a shared employer heading in HTML and Markdown while keeping standard, separate JSON Resume work entries.
• Add a prose quality gate that rejects attached unit symbols and requires <number><whitespace><unit>, including percentages.
• Make the HTML resume responsive on smartphones with fluid width and stacked contact, skills, and date layouts.
• Promote the HTML resume to the primary GitHub Pages action, place PDF second and open it in a browser tab, then list JSON and Markdown.

Why

The flat renderer repeated employer names and hid internal progression. The browser resume also retained a fixed A4 width on small screens, while the landing page emphasized PDF download over the responsive HTML version. Technical unit spacing was convention-based rather than enforced.

Impact

Career progression is clearer, the published HTML works at mobile widths, artifact actions follow the desired priority, and future resume edits fail CI when a number is attached directly to a recognised unit symbol.

Validation

• resume validate
• codespell .
• 84 non-browser tests passed
• 13 Chromium/PDF/site tests passed
• Production-style site build completed
• Responsive resume visually checked at a 390 px viewport