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.

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[ehennestad]

Superseded by #62 + ehennestad/matbox-actions#8: badge rendering moves out of MATLAB entirely — tasks emit badge JSON and CI renders SVGs with badge-maker (the shields.io reference implementation), so no MATLAB reimplementation of the badge format is needed.

For the record, review of this branch found two blockers beyond the merge conflict: (1) the new test class errors during class setup (CreateBadgeSvgTest.OutputFolder is referenced without its matboxtools.unittest namespace qualifier), so all 8 tests fail without running; (2) the generated SVGs are not byte-identical to the committed pybadges badges as claimed — both tests.svg and code_issues.svg differ in section widths (e.g. the width-table entry for the digit '1'), and most of the 95-entry character-width table cannot have been derived from the repo badges, which only exercise ~15 distinct characters.

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