Replace deprecated pybadges Python dependency with pure MATLAB SVG generator

[Copilot]

pybadges is deprecated and requires Python, pip, and runtime package installation just to write an SVG string. This PR removes that dependency entirely with a self-contained MATLAB implementation.

Implementation

• createBadgeSvg.m — Full rewrite. Drops all matbox.py.* and py.pybadges.* calls. SVG generation is now handled by four local functions:

  • generateBadgeSvg — assembles the shields.io flat-badge SVG format
  • computeTextWidth — sums per-character widths using a Verdana 11 px lookup table
  • getCharWidths — 95-entry table (ASCII 32–126) reverse-engineered from existing repo badges; output is byte-identical to pybadges for verified inputs
  • xmlEscape — sanitises label/message before embedding in XML

• PyNamespaceTest.m — Removed the three test methods that installed, uninstalled, and queried pybadges. The general pip-error test is retained.

• CreateBadgeSvgTest.m — New test class covering file creation, SVG structure, all five colours, custom filename, space→underscore conversion, colour hex correctness, XML escaping, and the missing-path error.

Example

% Before: required Python + pip + pybadges at runtime
matbox.utility.createBadgeSvg("tests", "21 passed", "green", projectDir)

% After: identical call, pure MATLAB, no external dependencies
matbox.utility.createBadgeSvg("tests", "21 passed", "green", projectDir)

The generated SVG matches the existing .github/badges/*.svg files exactly.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.